Annotation of src/usr.bin/ssh/monitor.c, Revision 1.130
1.130 ! tedu 1: /* $OpenBSD: monitor.c,v 1.129 2014/01/29 06:18:35 djm Exp $ */
1.1 provos 2: /*
3: * Copyright 2002 Niels Provos <provos@citi.umich.edu>
4: * Copyright 2002 Markus Friedl <markus@openbsd.org>
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: *
16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26: */
27:
1.67 stevesk 28: #include <sys/types.h>
29: #include <sys/wait.h>
1.79 stevesk 30: #include <sys/socket.h>
1.85 deraadt 31: #include <sys/tree.h>
1.83 stevesk 32: #include <sys/param.h>
1.95 djm 33: #include <sys/queue.h>
1.1 provos 34:
1.78 stevesk 35: #include <openssl/dh.h>
36:
1.81 stevesk 37: #include <errno.h>
1.80 stevesk 38: #include <fcntl.h>
1.65 stevesk 39: #include <paths.h>
1.114 djm 40: #include <poll.h>
1.78 stevesk 41: #include <pwd.h>
1.68 stevesk 42: #include <signal.h>
1.84 stevesk 43: #include <stdlib.h>
1.82 stevesk 44: #include <string.h>
1.1 provos 45:
1.114 djm 46: #include "atomicio.h"
1.85 deraadt 47: #include "xmalloc.h"
1.1 provos 48: #include "ssh.h"
1.85 deraadt 49: #include "key.h"
50: #include "buffer.h"
51: #include "hostfile.h"
1.1 provos 52: #include "auth.h"
1.85 deraadt 53: #include "cipher.h"
1.1 provos 54: #include "kex.h"
55: #include "dh.h"
1.88 miod 56: #include <zlib.h>
1.1 provos 57: #include "packet.h"
58: #include "auth-options.h"
59: #include "sshpty.h"
60: #include "channels.h"
61: #include "session.h"
62: #include "sshlogin.h"
63: #include "canohost.h"
64: #include "log.h"
65: #include "servconf.h"
66: #include "monitor.h"
67: #include "monitor_mm.h"
1.85 deraadt 68: #ifdef GSSAPI
69: #include "ssh-gss.h"
70: #endif
1.1 provos 71: #include "monitor_wrap.h"
72: #include "monitor_fdpass.h"
73: #include "misc.h"
74: #include "compat.h"
75: #include "ssh2.h"
1.104 andreas 76: #include "roaming.h"
1.127 markus 77: #include "authfd.h"
1.1 provos 78:
1.46 markus 79: #ifdef GSSAPI
80: static Gssctxt *gsscontext = NULL;
81: #endif
82:
1.1 provos 83: /* Imports */
84: extern ServerOptions options;
85: extern u_int utmp_len;
86: extern Newkeys *current_keys[];
87: extern z_stream incoming_stream;
88: extern z_stream outgoing_stream;
89: extern u_char session_id[];
90: extern Buffer auth_debug;
91: extern int auth_debug_init;
1.61 dtucker 92: extern Buffer loginmsg;
1.1 provos 93:
94: /* State exported from the child */
95:
96: struct {
97: z_stream incoming;
98: z_stream outgoing;
99: u_char *keyin;
100: u_int keyinlen;
101: u_char *keyout;
102: u_int keyoutlen;
103: u_char *ivin;
104: u_int ivinlen;
105: u_char *ivout;
106: u_int ivoutlen;
1.15 markus 107: u_char *ssh1key;
108: u_int ssh1keylen;
1.1 provos 109: int ssh1cipher;
110: int ssh1protoflags;
111: u_char *input;
112: u_int ilen;
113: u_char *output;
114: u_int olen;
1.103 andreas 115: u_int64_t sent_bytes;
116: u_int64_t recv_bytes;
1.1 provos 117: } child_state;
118:
1.43 markus 119: /* Functions on the monitor that answer unprivileged requests */
1.1 provos 120:
121: int mm_answer_moduli(int, Buffer *);
122: int mm_answer_sign(int, Buffer *);
123: int mm_answer_pwnamallow(int, Buffer *);
1.10 djm 124: int mm_answer_auth2_read_banner(int, Buffer *);
1.1 provos 125: int mm_answer_authserv(int, Buffer *);
126: int mm_answer_authpassword(int, Buffer *);
127: int mm_answer_bsdauthquery(int, Buffer *);
128: int mm_answer_bsdauthrespond(int, Buffer *);
129: int mm_answer_skeyquery(int, Buffer *);
130: int mm_answer_skeyrespond(int, Buffer *);
131: int mm_answer_keyallowed(int, Buffer *);
132: int mm_answer_keyverify(int, Buffer *);
133: int mm_answer_pty(int, Buffer *);
134: int mm_answer_pty_cleanup(int, Buffer *);
135: int mm_answer_term(int, Buffer *);
136: int mm_answer_rsa_keyallowed(int, Buffer *);
137: int mm_answer_rsa_challenge(int, Buffer *);
138: int mm_answer_rsa_response(int, Buffer *);
139: int mm_answer_sesskey(int, Buffer *);
140: int mm_answer_sessid(int, Buffer *);
141:
1.46 markus 142: #ifdef GSSAPI
143: int mm_answer_gss_setup_ctx(int, Buffer *);
144: int mm_answer_gss_accept_ctx(int, Buffer *);
145: int mm_answer_gss_userok(int, Buffer *);
1.52 markus 146: int mm_answer_gss_checkmic(int, Buffer *);
1.46 markus 147: #endif
1.25 itojun 148:
1.114 djm 149: static int monitor_read_log(struct monitor *);
150:
1.1 provos 151: static Authctxt *authctxt;
152: static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
153:
154: /* local state for key verify */
155: static u_char *key_blob = NULL;
156: static u_int key_bloblen = 0;
157: static int key_blobtype = MM_NOKEY;
1.26 markus 158: static char *hostbased_cuser = NULL;
159: static char *hostbased_chost = NULL;
1.1 provos 160: static char *auth_method = "unknown";
1.119 djm 161: static char *auth_submethod = NULL;
1.44 markus 162: static u_int session_id2_len = 0;
1.13 markus 163: static u_char *session_id2 = NULL;
1.40 markus 164: static pid_t monitor_child_pid;
1.1 provos 165:
166: struct mon_table {
167: enum monitor_reqtype type;
168: int flags;
169: int (*f)(int, Buffer *);
170: };
171:
172: #define MON_ISAUTH 0x0004 /* Required for Authentication */
173: #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
174: #define MON_ONCE 0x0010 /* Disable after calling */
1.77 dtucker 175: #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */
1.1 provos 176:
177: #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
178:
179: #define MON_PERMIT 0x1000 /* Request is permitted */
180:
181: struct mon_table mon_dispatch_proto20[] = {
182: {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
183: {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
184: {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
185: {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
1.10 djm 186: {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
1.1 provos 187: {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
188: {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
1.66 stevesk 189: {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
1.1 provos 190: {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
191: {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
1.46 markus 192: #ifdef GSSAPI
193: {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
194: {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
195: {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
1.52 markus 196: {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
1.46 markus 197: #endif
1.1 provos 198: {0, 0, NULL}
199: };
200:
201: struct mon_table mon_dispatch_postauth20[] = {
202: {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
203: {MONITOR_REQ_SIGN, 0, mm_answer_sign},
204: {MONITOR_REQ_PTY, 0, mm_answer_pty},
205: {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
206: {MONITOR_REQ_TERM, 0, mm_answer_term},
207: {0, 0, NULL}
208: };
209:
210: struct mon_table mon_dispatch_proto15[] = {
211: {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
212: {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
213: {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
214: {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
1.77 dtucker 215: {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed},
216: {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed},
1.1 provos 217: {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
218: {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
219: {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
1.66 stevesk 220: {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
1.1 provos 221: {0, 0, NULL}
222: };
223:
224: struct mon_table mon_dispatch_postauth15[] = {
225: {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
226: {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
227: {MONITOR_REQ_TERM, 0, mm_answer_term},
228: {0, 0, NULL}
229: };
230:
231: struct mon_table *mon_dispatch;
232:
233: /* Specifies if a certain message is allowed at the moment */
234:
235: static void
236: monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
237: {
238: while (ent->f != NULL) {
239: if (ent->type == type) {
240: ent->flags &= ~MON_PERMIT;
241: ent->flags |= permit ? MON_PERMIT : 0;
242: return;
243: }
244: ent++;
245: }
246: }
247:
248: static void
249: monitor_permit_authentications(int permit)
250: {
251: struct mon_table *ent = mon_dispatch;
252:
253: while (ent->f != NULL) {
254: if (ent->flags & MON_AUTH) {
255: ent->flags &= ~MON_PERMIT;
256: ent->flags |= permit ? MON_PERMIT : 0;
257: }
258: ent++;
259: }
260: }
261:
1.50 markus 262: void
263: monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
1.1 provos 264: {
265: struct mon_table *ent;
1.119 djm 266: int authenticated = 0, partial = 0;
1.1 provos 267:
268: debug3("preauth child monitor started");
269:
1.114 djm 270: close(pmonitor->m_recvfd);
271: close(pmonitor->m_log_sendfd);
272: pmonitor->m_log_sendfd = pmonitor->m_recvfd = -1;
273:
1.50 markus 274: authctxt = _authctxt;
275: memset(authctxt, 0, sizeof(*authctxt));
276:
1.1 provos 277: if (compat20) {
278: mon_dispatch = mon_dispatch_proto20;
279:
280: /* Permit requests for moduli and signatures */
281: monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
282: monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
283: } else {
284: mon_dispatch = mon_dispatch_proto15;
285:
286: monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
287: }
288:
289: /* The first few requests do not require asynchronous access */
290: while (!authenticated) {
1.119 djm 291: partial = 0;
1.77 dtucker 292: auth_method = "unknown";
1.119 djm 293: auth_submethod = NULL;
1.89 markus 294: authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1);
1.118 djm 295:
296: /* Special handling for multiple required authentications */
297: if (options.num_auth_methods != 0) {
298: if (!compat20)
299: fatal("AuthenticationMethods is not supported"
300: "with SSH protocol 1");
301: if (authenticated &&
302: !auth2_update_methods_lists(authctxt,
1.122 markus 303: auth_method, auth_submethod)) {
1.118 djm 304: debug3("%s: method %s: partial", __func__,
305: auth_method);
306: authenticated = 0;
1.119 djm 307: partial = 1;
1.118 djm 308: }
309: }
310:
1.1 provos 311: if (authenticated) {
312: if (!(ent->flags & MON_AUTHDECIDE))
313: fatal("%s: unexpected authentication from %d",
1.14 markus 314: __func__, ent->type);
1.1 provos 315: if (authctxt->pw->pw_uid == 0 &&
316: !auth_root_allowed(auth_method))
317: authenticated = 0;
318: }
1.77 dtucker 319: if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) {
1.119 djm 320: auth_log(authctxt, authenticated, partial,
1.125 djm 321: auth_method, auth_submethod);
1.1 provos 322: if (!authenticated)
323: authctxt->failures++;
324: }
325: }
326:
327: if (!authctxt->valid)
1.14 markus 328: fatal("%s: authenticated invalid user", __func__);
1.77 dtucker 329: if (strcmp(auth_method, "unknown") == 0)
330: fatal("%s: authentication method name unknown", __func__);
1.1 provos 331:
332: debug("%s: %s has been authenticated by privileged process",
1.14 markus 333: __func__, authctxt->user);
1.1 provos 334:
1.11 mouring 335: mm_get_keystate(pmonitor);
1.120 markus 336:
337: /* Drain any buffered messages from the child */
338: while (pmonitor->m_log_recvfd != -1 && monitor_read_log(pmonitor) == 0)
339: ;
1.114 djm 340:
341: close(pmonitor->m_sendfd);
342: close(pmonitor->m_log_recvfd);
343: pmonitor->m_sendfd = pmonitor->m_log_recvfd = -1;
1.1 provos 344: }
345:
1.40 markus 346: static void
347: monitor_set_child_handler(pid_t pid)
348: {
349: monitor_child_pid = pid;
350: }
351:
352: static void
1.59 avsm 353: monitor_child_handler(int sig)
1.40 markus 354: {
1.59 avsm 355: kill(monitor_child_pid, sig);
1.40 markus 356: }
357:
1.1 provos 358: void
1.11 mouring 359: monitor_child_postauth(struct monitor *pmonitor)
1.1 provos 360: {
1.114 djm 361: close(pmonitor->m_recvfd);
362: pmonitor->m_recvfd = -1;
363:
1.40 markus 364: monitor_set_child_handler(pmonitor->m_pid);
365: signal(SIGHUP, &monitor_child_handler);
366: signal(SIGTERM, &monitor_child_handler);
1.91 djm 367: signal(SIGINT, &monitor_child_handler);
1.40 markus 368:
1.1 provos 369: if (compat20) {
370: mon_dispatch = mon_dispatch_postauth20;
371:
372: /* Permit requests for moduli and signatures */
373: monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
374: monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
375: monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
376: } else {
377: mon_dispatch = mon_dispatch_postauth15;
378: monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
379: }
380: if (!no_pty_flag) {
381: monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
382: monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
383: }
384:
385: for (;;)
1.11 mouring 386: monitor_read(pmonitor, mon_dispatch, NULL);
1.1 provos 387: }
388:
389: void
1.11 mouring 390: monitor_sync(struct monitor *pmonitor)
1.1 provos 391: {
1.16 djm 392: if (options.compression) {
393: /* The member allocation is not visible, so sync it */
394: mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
395: }
1.1 provos 396: }
397:
1.114 djm 398: static int
399: monitor_read_log(struct monitor *pmonitor)
400: {
401: Buffer logmsg;
402: u_int len, level;
403: char *msg;
404:
405: buffer_init(&logmsg);
406:
407: /* Read length */
408: buffer_append_space(&logmsg, 4);
409: if (atomicio(read, pmonitor->m_log_recvfd,
410: buffer_ptr(&logmsg), buffer_len(&logmsg)) != buffer_len(&logmsg)) {
411: if (errno == EPIPE) {
1.116 djm 412: buffer_free(&logmsg);
1.114 djm 413: debug("%s: child log fd closed", __func__);
414: close(pmonitor->m_log_recvfd);
415: pmonitor->m_log_recvfd = -1;
416: return -1;
417: }
418: fatal("%s: log fd read: %s", __func__, strerror(errno));
419: }
420: len = buffer_get_int(&logmsg);
421: if (len <= 4 || len > 8192)
422: fatal("%s: invalid log message length %u", __func__, len);
423:
424: /* Read severity, message */
425: buffer_clear(&logmsg);
426: buffer_append_space(&logmsg, len);
427: if (atomicio(read, pmonitor->m_log_recvfd,
428: buffer_ptr(&logmsg), buffer_len(&logmsg)) != buffer_len(&logmsg))
429: fatal("%s: log fd read: %s", __func__, strerror(errno));
430:
431: /* Log it */
432: level = buffer_get_int(&logmsg);
433: msg = buffer_get_string(&logmsg, NULL);
434: if (log_level_name(level) == NULL)
435: fatal("%s: invalid log level %u (corrupted message?)",
436: __func__, level);
437: do_log2(level, "%s [preauth]", msg);
438:
439: buffer_free(&logmsg);
1.124 djm 440: free(msg);
1.114 djm 441:
442: return 0;
443: }
444:
1.1 provos 445: int
1.11 mouring 446: monitor_read(struct monitor *pmonitor, struct mon_table *ent,
1.1 provos 447: struct mon_table **pent)
448: {
449: Buffer m;
450: int ret;
451: u_char type;
1.114 djm 452: struct pollfd pfd[2];
453:
454: for (;;) {
1.130 ! tedu 455: memset(&pfd, 0, sizeof(pfd));
1.114 djm 456: pfd[0].fd = pmonitor->m_sendfd;
457: pfd[0].events = POLLIN;
458: pfd[1].fd = pmonitor->m_log_recvfd;
459: pfd[1].events = pfd[1].fd == -1 ? 0 : POLLIN;
1.115 djm 460: if (poll(pfd, pfd[1].fd == -1 ? 1 : 2, -1) == -1) {
461: if (errno == EINTR || errno == EAGAIN)
462: continue;
1.114 djm 463: fatal("%s: poll: %s", __func__, strerror(errno));
1.115 djm 464: }
1.114 djm 465: if (pfd[1].revents) {
466: /*
467: * Drain all log messages before processing next
468: * monitor request.
469: */
470: monitor_read_log(pmonitor);
471: continue;
472: }
473: if (pfd[0].revents)
474: break; /* Continues below */
475: }
1.1 provos 476:
477: buffer_init(&m);
478:
1.11 mouring 479: mm_request_receive(pmonitor->m_sendfd, &m);
1.1 provos 480: type = buffer_get_char(&m);
481:
1.14 markus 482: debug3("%s: checking request %d", __func__, type);
1.1 provos 483:
484: while (ent->f != NULL) {
485: if (ent->type == type)
486: break;
487: ent++;
488: }
489:
490: if (ent->f != NULL) {
491: if (!(ent->flags & MON_PERMIT))
1.14 markus 492: fatal("%s: unpermitted request %d", __func__,
1.1 provos 493: type);
1.11 mouring 494: ret = (*ent->f)(pmonitor->m_sendfd, &m);
1.1 provos 495: buffer_free(&m);
496:
497: /* The child may use this request only once, disable it */
498: if (ent->flags & MON_ONCE) {
1.14 markus 499: debug2("%s: %d used once, disabling now", __func__,
1.1 provos 500: type);
501: ent->flags &= ~MON_PERMIT;
502: }
503:
504: if (pent != NULL)
505: *pent = ent;
1.3 markus 506:
1.1 provos 507: return ret;
508: }
509:
1.14 markus 510: fatal("%s: unsupported request: %d", __func__, type);
1.1 provos 511:
512: /* NOTREACHED */
513: return (-1);
514: }
515:
516: /* allowed key state */
517: static int
518: monitor_allowed_key(u_char *blob, u_int bloblen)
519: {
520: /* make sure key is allowed */
521: if (key_blob == NULL || key_bloblen != bloblen ||
1.108 djm 522: timingsafe_bcmp(key_blob, blob, key_bloblen))
1.1 provos 523: return (0);
524: return (1);
525: }
526:
527: static void
528: monitor_reset_key_state(void)
529: {
530: /* reset state */
1.124 djm 531: free(key_blob);
532: free(hostbased_cuser);
533: free(hostbased_chost);
1.1 provos 534: key_blob = NULL;
535: key_bloblen = 0;
536: key_blobtype = MM_NOKEY;
537: hostbased_cuser = NULL;
538: hostbased_chost = NULL;
539: }
540:
541: int
1.59 avsm 542: mm_answer_moduli(int sock, Buffer *m)
1.1 provos 543: {
544: DH *dh;
545: int min, want, max;
546:
547: min = buffer_get_int(m);
548: want = buffer_get_int(m);
549: max = buffer_get_int(m);
550:
551: debug3("%s: got parameters: %d %d %d",
1.14 markus 552: __func__, min, want, max);
1.1 provos 553: /* We need to check here, too, in case the child got corrupted */
554: if (max < min || want < min || max < want)
555: fatal("%s: bad parameters: %d %d %d",
1.14 markus 556: __func__, min, want, max);
1.1 provos 557:
558: buffer_clear(m);
559:
560: dh = choose_dh(min, want, max);
561: if (dh == NULL) {
562: buffer_put_char(m, 0);
563: return (0);
564: } else {
565: /* Send first bignum */
566: buffer_put_char(m, 1);
567: buffer_put_bignum2(m, dh->p);
568: buffer_put_bignum2(m, dh->g);
1.3 markus 569:
1.1 provos 570: DH_free(dh);
571: }
1.59 avsm 572: mm_request_send(sock, MONITOR_ANS_MODULI, m);
1.1 provos 573: return (0);
574: }
575:
1.127 markus 576: extern AuthenticationConnection *auth_conn;
577:
1.1 provos 578: int
1.59 avsm 579: mm_answer_sign(int sock, Buffer *m)
1.1 provos 580: {
581: Key *key;
582: u_char *p;
583: u_char *signature;
584: u_int siglen, datlen;
585: int keyid;
1.3 markus 586:
1.14 markus 587: debug3("%s", __func__);
1.1 provos 588:
1.3 markus 589: keyid = buffer_get_int(m);
590: p = buffer_get_string(m, &datlen);
1.1 provos 591:
1.69 djm 592: /*
1.110 djm 593: * Supported KEX types use SHA1 (20 bytes), SHA256 (32 bytes),
594: * SHA384 (48 bytes) and SHA512 (64 bytes).
1.69 djm 595: */
1.110 djm 596: if (datlen != 20 && datlen != 32 && datlen != 48 && datlen != 64)
1.19 deraadt 597: fatal("%s: data length incorrect: %u", __func__, datlen);
1.1 provos 598:
1.13 markus 599: /* save session id, it will be passed on the first call */
600: if (session_id2_len == 0) {
601: session_id2_len = datlen;
602: session_id2 = xmalloc(session_id2_len);
603: memcpy(session_id2, p, session_id2_len);
604: }
605:
1.127 markus 606: if ((key = get_hostkey_by_index(keyid)) != NULL) {
607: if (key_sign(key, &signature, &siglen, p, datlen) < 0)
608: fatal("%s: key_sign failed", __func__);
609: } else if ((key = get_hostkey_public_by_index(keyid)) != NULL &&
610: auth_conn != NULL) {
611: if (ssh_agent_sign(auth_conn, key, &signature, &siglen, p,
612: datlen) < 0)
613: fatal("%s: ssh_agent_sign failed", __func__);
614: } else
1.14 markus 615: fatal("%s: no hostkey from index %d", __func__, keyid);
1.1 provos 616:
1.19 deraadt 617: debug3("%s: signature %p(%u)", __func__, signature, siglen);
1.1 provos 618:
619: buffer_clear(m);
620: buffer_put_string(m, signature, siglen);
621:
1.124 djm 622: free(p);
623: free(signature);
1.1 provos 624:
1.59 avsm 625: mm_request_send(sock, MONITOR_ANS_SIGN, m);
1.1 provos 626:
627: /* Turn on permissions for getpwnam */
628: monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
629:
630: return (0);
631: }
632:
633: /* Retrieves the password entry and also checks if the user is permitted */
634:
635: int
1.59 avsm 636: mm_answer_pwnamallow(int sock, Buffer *m)
1.1 provos 637: {
1.60 dtucker 638: char *username;
1.1 provos 639: struct passwd *pwent;
640: int allowed = 0;
1.113 djm 641: u_int i;
1.3 markus 642:
1.14 markus 643: debug3("%s", __func__);
1.1 provos 644:
645: if (authctxt->attempt++ != 0)
1.14 markus 646: fatal("%s: multiple attempts for getpwnam", __func__);
1.1 provos 647:
1.60 dtucker 648: username = buffer_get_string(m, NULL);
1.1 provos 649:
1.60 dtucker 650: pwent = getpwnamallow(username);
1.1 provos 651:
1.60 dtucker 652: authctxt->user = xstrdup(username);
653: setproctitle("%s [priv]", pwent ? username : "unknown");
1.124 djm 654: free(username);
1.1 provos 655:
656: buffer_clear(m);
657:
658: if (pwent == NULL) {
659: buffer_put_char(m, 0);
1.53 djm 660: authctxt->pw = fakepw();
1.1 provos 661: goto out;
662: }
663:
664: allowed = 1;
1.4 markus 665: authctxt->pw = pwent;
1.1 provos 666: authctxt->valid = 1;
667:
668: buffer_put_char(m, 1);
669: buffer_put_string(m, pwent, sizeof(struct passwd));
670: buffer_put_cstring(m, pwent->pw_name);
671: buffer_put_cstring(m, "*");
672: buffer_put_cstring(m, pwent->pw_gecos);
673: buffer_put_cstring(m, pwent->pw_class);
674: buffer_put_cstring(m, pwent->pw_dir);
675: buffer_put_cstring(m, pwent->pw_shell);
1.94 dtucker 676:
677: out:
1.90 dtucker 678: buffer_put_string(m, &options, sizeof(options));
1.112 djm 679:
680: #define M_CP_STROPT(x) do { \
681: if (options.x != NULL) \
682: buffer_put_cstring(m, options.x); \
683: } while (0)
1.113 djm 684: #define M_CP_STRARRAYOPT(x, nx) do { \
685: for (i = 0; i < options.nx; i++) \
686: buffer_put_cstring(m, options.x[i]); \
687: } while (0)
1.112 djm 688: /* See comment in servconf.h */
689: COPY_MATCH_STRING_OPTS();
690: #undef M_CP_STROPT
1.113 djm 691: #undef M_CP_STRARRAYOPT
1.118 djm 692:
693: /* Create valid auth method lists */
694: if (compat20 && auth2_setup_methods_lists(authctxt) != 0) {
695: /*
696: * The monitor will continue long enough to let the child
697: * run to it's packet_disconnect(), but it must not allow any
698: * authentication to succeed.
699: */
700: debug("%s: no valid authentication method lists", __func__);
701: }
702:
1.14 markus 703: debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
1.59 avsm 704: mm_request_send(sock, MONITOR_ANS_PWNAM, m);
1.1 provos 705:
706: /* For SSHv1 allow authentication now */
707: if (!compat20)
708: monitor_permit_authentications(1);
1.10 djm 709: else {
1.1 provos 710: /* Allow service/style information on the auth context */
711: monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
1.10 djm 712: monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
713: }
714:
715: return (0);
716: }
717:
1.59 avsm 718: int mm_answer_auth2_read_banner(int sock, Buffer *m)
1.10 djm 719: {
720: char *banner;
721:
722: buffer_clear(m);
723: banner = auth2_read_banner();
724: buffer_put_cstring(m, banner != NULL ? banner : "");
1.59 avsm 725: mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
1.124 djm 726: free(banner);
1.1 provos 727:
728: return (0);
729: }
730:
731: int
1.59 avsm 732: mm_answer_authserv(int sock, Buffer *m)
1.1 provos 733: {
734: monitor_permit_authentications(1);
735:
736: authctxt->service = buffer_get_string(m, NULL);
737: authctxt->style = buffer_get_string(m, NULL);
1.6 stevesk 738: debug3("%s: service=%s, style=%s",
1.14 markus 739: __func__, authctxt->service, authctxt->style);
1.6 stevesk 740:
1.1 provos 741: if (strlen(authctxt->style) == 0) {
1.124 djm 742: free(authctxt->style);
1.1 provos 743: authctxt->style = NULL;
744: }
745:
746: return (0);
747: }
748:
749: int
1.59 avsm 750: mm_answer_authpassword(int sock, Buffer *m)
1.1 provos 751: {
752: static int call_count;
753: char *passwd;
1.22 stevesk 754: int authenticated;
755: u_int plen;
1.1 provos 756:
757: passwd = buffer_get_string(m, &plen);
758: /* Only authenticate if the context is valid */
1.12 markus 759: authenticated = options.password_authentication &&
1.48 markus 760: auth_password(authctxt, passwd);
1.1 provos 761: memset(passwd, 0, strlen(passwd));
1.124 djm 762: free(passwd);
1.1 provos 763:
764: buffer_clear(m);
765: buffer_put_int(m, authenticated);
766:
1.14 markus 767: debug3("%s: sending result %d", __func__, authenticated);
1.59 avsm 768: mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
1.1 provos 769:
770: call_count++;
771: if (plen == 0 && call_count == 1)
772: auth_method = "none";
773: else
774: auth_method = "password";
775:
776: /* Causes monitor loop to terminate if authenticated */
777: return (authenticated);
778: }
779:
780: int
1.59 avsm 781: mm_answer_bsdauthquery(int sock, Buffer *m)
1.1 provos 782: {
783: char *name, *infotxt;
784: u_int numprompts;
785: u_int *echo_on;
786: char **prompts;
1.31 markus 787: u_int success;
1.1 provos 788:
1.31 markus 789: success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
790: &prompts, &echo_on) < 0 ? 0 : 1;
1.1 provos 791:
792: buffer_clear(m);
1.31 markus 793: buffer_put_int(m, success);
794: if (success)
1.1 provos 795: buffer_put_cstring(m, prompts[0]);
796:
1.31 markus 797: debug3("%s: sending challenge success: %u", __func__, success);
1.59 avsm 798: mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
1.1 provos 799:
1.31 markus 800: if (success) {
1.124 djm 801: free(name);
802: free(infotxt);
803: free(prompts);
804: free(echo_on);
1.1 provos 805: }
806:
807: return (0);
808: }
809:
810: int
1.59 avsm 811: mm_answer_bsdauthrespond(int sock, Buffer *m)
1.1 provos 812: {
813: char *response;
814: int authok;
815:
816: if (authctxt->as == 0)
1.14 markus 817: fatal("%s: no bsd auth session", __func__);
1.1 provos 818:
819: response = buffer_get_string(m, NULL);
1.12 markus 820: authok = options.challenge_response_authentication &&
821: auth_userresponse(authctxt->as, response, 0);
1.1 provos 822: authctxt->as = NULL;
1.14 markus 823: debug3("%s: <%s> = <%d>", __func__, response, authok);
1.124 djm 824: free(response);
1.1 provos 825:
826: buffer_clear(m);
827: buffer_put_int(m, authok);
828:
1.14 markus 829: debug3("%s: sending authenticated: %d", __func__, authok);
1.59 avsm 830: mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
1.1 provos 831:
1.122 markus 832: if (compat20) {
833: auth_method = "keyboard-interactive";
834: auth_submethod = "bsdauth";
835: } else
1.118 djm 836: auth_method = "bsdauth";
1.1 provos 837:
838: return (authok != 0);
839: }
840:
841: int
1.59 avsm 842: mm_answer_keyallowed(int sock, Buffer *m)
1.1 provos 843: {
844: Key *key;
1.26 markus 845: char *cuser, *chost;
846: u_char *blob;
1.1 provos 847: u_int bloblen;
848: enum mm_keytype type = 0;
849: int allowed = 0;
850:
1.14 markus 851: debug3("%s entering", __func__);
1.3 markus 852:
1.1 provos 853: type = buffer_get_int(m);
854: cuser = buffer_get_string(m, NULL);
855: chost = buffer_get_string(m, NULL);
856: blob = buffer_get_string(m, &bloblen);
857:
858: key = key_from_blob(blob, bloblen);
859:
860: if ((compat20 && type == MM_RSAHOSTKEY) ||
861: (!compat20 && type != MM_RSAHOSTKEY))
1.14 markus 862: fatal("%s: key type and protocol mismatch", __func__);
1.1 provos 863:
1.14 markus 864: debug3("%s: key_from_blob: %p", __func__, key);
1.1 provos 865:
1.51 djm 866: if (key != NULL && authctxt->valid) {
1.63 deraadt 867: switch (type) {
1.1 provos 868: case MM_USERKEY:
1.12 markus 869: allowed = options.pubkey_authentication &&
870: user_key_allowed(authctxt->pw, key);
1.126 djm 871: pubkey_auth_info(authctxt, key, NULL);
1.77 dtucker 872: auth_method = "publickey";
1.97 dtucker 873: if (options.pubkey_authentication && allowed != 1)
874: auth_clear_options();
1.1 provos 875: break;
876: case MM_HOSTKEY:
1.12 markus 877: allowed = options.hostbased_authentication &&
878: hostbased_key_allowed(authctxt->pw,
1.1 provos 879: cuser, chost, key);
1.126 djm 880: pubkey_auth_info(authctxt, key,
881: "client user \"%.100s\", client host \"%.100s\"",
882: cuser, chost);
1.77 dtucker 883: auth_method = "hostbased";
1.1 provos 884: break;
885: case MM_RSAHOSTKEY:
886: key->type = KEY_RSA1; /* XXX */
1.12 markus 887: allowed = options.rhosts_rsa_authentication &&
888: auth_rhosts_rsa_key_allowed(authctxt->pw,
1.1 provos 889: cuser, chost, key);
1.97 dtucker 890: if (options.rhosts_rsa_authentication && allowed != 1)
891: auth_clear_options();
1.77 dtucker 892: auth_method = "rsa";
1.1 provos 893: break;
894: default:
1.14 markus 895: fatal("%s: unknown key type %d", __func__, type);
1.1 provos 896: break;
897: }
1.33 markus 898: }
899: if (key != NULL)
1.1 provos 900: key_free(key);
901:
902: /* clear temporarily storage (used by verify) */
903: monitor_reset_key_state();
904:
905: if (allowed) {
906: /* Save temporarily for comparison in verify */
907: key_blob = blob;
908: key_bloblen = bloblen;
909: key_blobtype = type;
910: hostbased_cuser = cuser;
911: hostbased_chost = chost;
1.72 djm 912: } else {
1.77 dtucker 913: /* Log failed attempt */
1.125 djm 914: auth_log(authctxt, 0, 0, auth_method, NULL);
1.124 djm 915: free(blob);
916: free(cuser);
917: free(chost);
1.1 provos 918: }
919:
920: debug3("%s: key %p is %s",
1.98 dtucker 921: __func__, key, allowed ? "allowed" : "not allowed");
1.1 provos 922:
923: buffer_clear(m);
924: buffer_put_int(m, allowed);
1.32 markus 925: buffer_put_int(m, forced_command != NULL);
1.1 provos 926:
1.59 avsm 927: mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
1.1 provos 928:
929: if (type == MM_RSAHOSTKEY)
930: monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
931:
932: return (0);
933: }
934:
935: static int
936: monitor_valid_userblob(u_char *data, u_int datalen)
937: {
938: Buffer b;
1.121 djm 939: char *p, *userstyle;
1.1 provos 940: u_int len;
941: int fail = 0;
942:
943: buffer_init(&b);
944: buffer_append(&b, data, datalen);
1.3 markus 945:
1.1 provos 946: if (datafellows & SSH_OLD_SESSIONID) {
1.13 markus 947: p = buffer_ptr(&b);
948: len = buffer_len(&b);
949: if ((session_id2 == NULL) ||
950: (len < session_id2_len) ||
1.108 djm 951: (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1.13 markus 952: fail++;
1.1 provos 953: buffer_consume(&b, session_id2_len);
954: } else {
1.13 markus 955: p = buffer_get_string(&b, &len);
956: if ((session_id2 == NULL) ||
957: (len != session_id2_len) ||
1.108 djm 958: (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1.1 provos 959: fail++;
1.124 djm 960: free(p);
1.1 provos 961: }
962: if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
963: fail++;
1.121 djm 964: p = buffer_get_cstring(&b, NULL);
965: xasprintf(&userstyle, "%s%s%s", authctxt->user,
966: authctxt->style ? ":" : "",
967: authctxt->style ? authctxt->style : "");
968: if (strcmp(userstyle, p) != 0) {
1.38 itojun 969: logit("wrong user name passed to monitor: expected %s != %.100s",
1.121 djm 970: userstyle, p);
1.1 provos 971: fail++;
972: }
1.124 djm 973: free(userstyle);
974: free(p);
1.1 provos 975: buffer_skip_string(&b);
976: if (datafellows & SSH_BUG_PKAUTH) {
977: if (!buffer_get_char(&b))
978: fail++;
979: } else {
1.121 djm 980: p = buffer_get_cstring(&b, NULL);
1.1 provos 981: if (strcmp("publickey", p) != 0)
982: fail++;
1.124 djm 983: free(p);
1.1 provos 984: if (!buffer_get_char(&b))
985: fail++;
986: buffer_skip_string(&b);
987: }
988: buffer_skip_string(&b);
989: if (buffer_len(&b) != 0)
990: fail++;
991: buffer_free(&b);
992: return (fail == 0);
993: }
994:
995: static int
1.26 markus 996: monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
997: char *chost)
1.1 provos 998: {
999: Buffer b;
1.121 djm 1000: char *p, *userstyle;
1.1 provos 1001: u_int len;
1002: int fail = 0;
1003:
1004: buffer_init(&b);
1005: buffer_append(&b, data, datalen);
1.3 markus 1006:
1.13 markus 1007: p = buffer_get_string(&b, &len);
1008: if ((session_id2 == NULL) ||
1009: (len != session_id2_len) ||
1.108 djm 1010: (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1.1 provos 1011: fail++;
1.124 djm 1012: free(p);
1.13 markus 1013:
1.1 provos 1014: if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1015: fail++;
1.121 djm 1016: p = buffer_get_cstring(&b, NULL);
1017: xasprintf(&userstyle, "%s%s%s", authctxt->user,
1018: authctxt->style ? ":" : "",
1019: authctxt->style ? authctxt->style : "");
1020: if (strcmp(userstyle, p) != 0) {
1.38 itojun 1021: logit("wrong user name passed to monitor: expected %s != %.100s",
1.121 djm 1022: userstyle, p);
1.1 provos 1023: fail++;
1024: }
1.121 djm 1025: free(userstyle);
1.124 djm 1026: free(p);
1.1 provos 1027: buffer_skip_string(&b); /* service */
1.121 djm 1028: p = buffer_get_cstring(&b, NULL);
1.1 provos 1029: if (strcmp(p, "hostbased") != 0)
1030: fail++;
1.124 djm 1031: free(p);
1.1 provos 1032: buffer_skip_string(&b); /* pkalg */
1033: buffer_skip_string(&b); /* pkblob */
1034:
1035: /* verify client host, strip trailing dot if necessary */
1036: p = buffer_get_string(&b, NULL);
1037: if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1038: p[len - 1] = '\0';
1039: if (strcmp(p, chost) != 0)
1040: fail++;
1.124 djm 1041: free(p);
1.1 provos 1042:
1043: /* verify client user */
1044: p = buffer_get_string(&b, NULL);
1045: if (strcmp(p, cuser) != 0)
1046: fail++;
1.124 djm 1047: free(p);
1.1 provos 1048:
1049: if (buffer_len(&b) != 0)
1050: fail++;
1051: buffer_free(&b);
1052: return (fail == 0);
1053: }
1054:
1055: int
1.59 avsm 1056: mm_answer_keyverify(int sock, Buffer *m)
1.1 provos 1057: {
1058: Key *key;
1059: u_char *signature, *data, *blob;
1060: u_int signaturelen, datalen, bloblen;
1061: int verified = 0;
1062: int valid_data = 0;
1063:
1064: blob = buffer_get_string(m, &bloblen);
1065: signature = buffer_get_string(m, &signaturelen);
1066: data = buffer_get_string(m, &datalen);
1067:
1068: if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1.8 mouring 1069: !monitor_allowed_key(blob, bloblen))
1.14 markus 1070: fatal("%s: bad key, not previously allowed", __func__);
1.1 provos 1071:
1072: key = key_from_blob(blob, bloblen);
1073: if (key == NULL)
1.14 markus 1074: fatal("%s: bad public key blob", __func__);
1.1 provos 1075:
1076: switch (key_blobtype) {
1077: case MM_USERKEY:
1078: valid_data = monitor_valid_userblob(data, datalen);
1079: break;
1080: case MM_HOSTKEY:
1081: valid_data = monitor_valid_hostbasedblob(data, datalen,
1082: hostbased_cuser, hostbased_chost);
1083: break;
1084: default:
1085: valid_data = 0;
1086: break;
1087: }
1088: if (!valid_data)
1.14 markus 1089: fatal("%s: bad signature data blob", __func__);
1.1 provos 1090:
1091: verified = key_verify(key, signature, signaturelen, data, datalen);
1092: debug3("%s: key %p signature %s",
1.89 markus 1093: __func__, key, (verified == 1) ? "verified" : "unverified");
1.1 provos 1094:
1095: key_free(key);
1.124 djm 1096: free(blob);
1097: free(signature);
1098: free(data);
1.1 provos 1099:
1.17 stevesk 1100: auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1101:
1.1 provos 1102: monitor_reset_key_state();
1.3 markus 1103:
1.1 provos 1104: buffer_clear(m);
1105: buffer_put_int(m, verified);
1.59 avsm 1106: mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
1.1 provos 1107:
1.89 markus 1108: return (verified == 1);
1.1 provos 1109: }
1110:
1.2 markus 1111: static void
1.1 provos 1112: mm_record_login(Session *s, struct passwd *pw)
1113: {
1114: socklen_t fromlen;
1115: struct sockaddr_storage from;
1116:
1117: /*
1118: * Get IP address of client. If the connection is not a socket, let
1119: * the address be 0.0.0.0.
1120: */
1121: memset(&from, 0, sizeof(from));
1.24 stevesk 1122: fromlen = sizeof(from);
1.1 provos 1123: if (packet_connection_is_on_socket()) {
1124: if (getpeername(packet_get_connection_in(),
1.74 deraadt 1125: (struct sockaddr *)&from, &fromlen) < 0) {
1.1 provos 1126: debug("getpeername: %.100s", strerror(errno));
1.50 markus 1127: cleanup_exit(255);
1.1 provos 1128: }
1129: }
1130: /* Record that there was a login on that tty from the remote host. */
1131: record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1.42 markus 1132: get_remote_name_or_ip(utmp_len, options.use_dns),
1.24 stevesk 1133: (struct sockaddr *)&from, fromlen);
1.1 provos 1134: }
1135:
1136: static void
1137: mm_session_close(Session *s)
1138: {
1.41 djm 1139: debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
1.1 provos 1140: if (s->ttyfd != -1) {
1.86 stevesk 1141: debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1.1 provos 1142: session_pty_cleanup2(s);
1143: }
1.96 djm 1144: session_unused(s->self);
1.1 provos 1145: }
1146:
1147: int
1.59 avsm 1148: mm_answer_pty(int sock, Buffer *m)
1.1 provos 1149: {
1.11 mouring 1150: extern struct monitor *pmonitor;
1.1 provos 1151: Session *s;
1152: int res, fd0;
1153:
1.14 markus 1154: debug3("%s entering", __func__);
1.1 provos 1155:
1156: buffer_clear(m);
1157: s = session_new();
1158: if (s == NULL)
1159: goto error;
1160: s->authctxt = authctxt;
1161: s->pw = authctxt->pw;
1.11 mouring 1162: s->pid = pmonitor->m_pid;
1.1 provos 1163: res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1164: if (res == 0)
1165: goto error;
1166: pty_setowner(authctxt->pw, s->tty);
1167:
1168: buffer_put_int(m, 1);
1169: buffer_put_cstring(m, s->tty);
1170:
1171: /* We need to trick ttyslot */
1172: if (dup2(s->ttyfd, 0) == -1)
1.14 markus 1173: fatal("%s: dup2", __func__);
1.1 provos 1174:
1175: mm_record_login(s, authctxt->pw);
1176:
1177: /* Now we can close the file descriptor again */
1178: close(0);
1.61 dtucker 1179:
1180: /* send messages generated by record_login */
1181: buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
1182: buffer_clear(&loginmsg);
1183:
1184: mm_request_send(sock, MONITOR_ANS_PTY, m);
1185:
1.92 djm 1186: if (mm_send_fd(sock, s->ptyfd) == -1 ||
1187: mm_send_fd(sock, s->ttyfd) == -1)
1188: fatal("%s: send fds failed", __func__);
1.1 provos 1189:
1190: /* make sure nothing uses fd 0 */
1191: if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1.14 markus 1192: fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
1.1 provos 1193: if (fd0 != 0)
1.14 markus 1194: error("%s: fd0 %d != 0", __func__, fd0);
1.1 provos 1195:
1196: /* slave is not needed */
1197: close(s->ttyfd);
1198: s->ttyfd = s->ptyfd;
1199: /* no need to dup() because nobody closes ptyfd */
1200: s->ptymaster = s->ptyfd;
1201:
1.86 stevesk 1202: debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
1.1 provos 1203:
1204: return (0);
1205:
1206: error:
1207: if (s != NULL)
1208: mm_session_close(s);
1209: buffer_put_int(m, 0);
1.59 avsm 1210: mm_request_send(sock, MONITOR_ANS_PTY, m);
1.1 provos 1211: return (0);
1212: }
1213:
1214: int
1.59 avsm 1215: mm_answer_pty_cleanup(int sock, Buffer *m)
1.1 provos 1216: {
1217: Session *s;
1218: char *tty;
1219:
1.14 markus 1220: debug3("%s entering", __func__);
1.1 provos 1221:
1222: tty = buffer_get_string(m, NULL);
1223: if ((s = session_by_tty(tty)) != NULL)
1224: mm_session_close(s);
1225: buffer_clear(m);
1.124 djm 1226: free(tty);
1.1 provos 1227: return (0);
1228: }
1229:
1230: int
1.59 avsm 1231: mm_answer_sesskey(int sock, Buffer *m)
1.1 provos 1232: {
1233: BIGNUM *p;
1234: int rsafail;
1235:
1236: /* Turn off permissions */
1.62 dtucker 1237: monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0);
1.1 provos 1238:
1239: if ((p = BN_new()) == NULL)
1.14 markus 1240: fatal("%s: BN_new", __func__);
1.1 provos 1241:
1242: buffer_get_bignum2(m, p);
1243:
1244: rsafail = ssh1_session_key(p);
1245:
1246: buffer_clear(m);
1247: buffer_put_int(m, rsafail);
1248: buffer_put_bignum2(m, p);
1249:
1250: BN_clear_free(p);
1251:
1.59 avsm 1252: mm_request_send(sock, MONITOR_ANS_SESSKEY, m);
1.1 provos 1253:
1254: /* Turn on permissions for sessid passing */
1255: monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1256:
1257: return (0);
1258: }
1259:
1260: int
1.59 avsm 1261: mm_answer_sessid(int sock, Buffer *m)
1.1 provos 1262: {
1263: int i;
1264:
1.14 markus 1265: debug3("%s entering", __func__);
1.1 provos 1266:
1267: if (buffer_len(m) != 16)
1.14 markus 1268: fatal("%s: bad ssh1 session id", __func__);
1.1 provos 1269: for (i = 0; i < 16; i++)
1270: session_id[i] = buffer_get_char(m);
1271:
1272: /* Turn on permissions for getpwnam */
1273: monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1274:
1275: return (0);
1276: }
1277:
1278: int
1.59 avsm 1279: mm_answer_rsa_keyallowed(int sock, Buffer *m)
1.1 provos 1280: {
1281: BIGNUM *client_n;
1282: Key *key = NULL;
1.3 markus 1283: u_char *blob = NULL;
1284: u_int blen = 0;
1.1 provos 1285: int allowed = 0;
1286:
1.14 markus 1287: debug3("%s entering", __func__);
1.1 provos 1288:
1.77 dtucker 1289: auth_method = "rsa";
1.12 markus 1290: if (options.rsa_authentication && authctxt->valid) {
1.1 provos 1291: if ((client_n = BN_new()) == NULL)
1.14 markus 1292: fatal("%s: BN_new", __func__);
1.1 provos 1293: buffer_get_bignum2(m, client_n);
1294: allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1295: BN_clear_free(client_n);
1296: }
1297: buffer_clear(m);
1298: buffer_put_int(m, allowed);
1.32 markus 1299: buffer_put_int(m, forced_command != NULL);
1.1 provos 1300:
1301: /* clear temporarily storage (used by generate challenge) */
1302: monitor_reset_key_state();
1303:
1304: if (allowed && key != NULL) {
1305: key->type = KEY_RSA; /* cheat for key_to_blob */
1306: if (key_to_blob(key, &blob, &blen) == 0)
1.14 markus 1307: fatal("%s: key_to_blob failed", __func__);
1.1 provos 1308: buffer_put_string(m, blob, blen);
1309:
1310: /* Save temporarily for comparison in verify */
1311: key_blob = blob;
1312: key_bloblen = blen;
1313: key_blobtype = MM_RSAUSERKEY;
1.33 markus 1314: }
1315: if (key != NULL)
1.1 provos 1316: key_free(key);
1317:
1.59 avsm 1318: mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m);
1.1 provos 1319:
1320: monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1321: monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1322: return (0);
1323: }
1324:
1325: int
1.59 avsm 1326: mm_answer_rsa_challenge(int sock, Buffer *m)
1.1 provos 1327: {
1328: Key *key = NULL;
1.3 markus 1329: u_char *blob;
1330: u_int blen;
1.1 provos 1331:
1.14 markus 1332: debug3("%s entering", __func__);
1.1 provos 1333:
1334: if (!authctxt->valid)
1.14 markus 1335: fatal("%s: authctxt not valid", __func__);
1.1 provos 1336: blob = buffer_get_string(m, &blen);
1337: if (!monitor_allowed_key(blob, blen))
1.14 markus 1338: fatal("%s: bad key, not previously allowed", __func__);
1.1 provos 1339: if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1.14 markus 1340: fatal("%s: key type mismatch", __func__);
1.1 provos 1341: if ((key = key_from_blob(blob, blen)) == NULL)
1.14 markus 1342: fatal("%s: received bad key", __func__);
1.101 djm 1343: if (key->type != KEY_RSA)
1344: fatal("%s: received bad key type %d", __func__, key->type);
1345: key->type = KEY_RSA1;
1.1 provos 1346: if (ssh1_challenge)
1347: BN_clear_free(ssh1_challenge);
1348: ssh1_challenge = auth_rsa_generate_challenge(key);
1349:
1350: buffer_clear(m);
1351: buffer_put_bignum2(m, ssh1_challenge);
1352:
1.14 markus 1353: debug3("%s sending reply", __func__);
1.59 avsm 1354: mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m);
1.1 provos 1355:
1356: monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1.33 markus 1357:
1.124 djm 1358: free(blob);
1.33 markus 1359: key_free(key);
1.1 provos 1360: return (0);
1361: }
1362:
1363: int
1.59 avsm 1364: mm_answer_rsa_response(int sock, Buffer *m)
1.1 provos 1365: {
1366: Key *key = NULL;
1.3 markus 1367: u_char *blob, *response;
1368: u_int blen, len;
1369: int success;
1.1 provos 1370:
1.14 markus 1371: debug3("%s entering", __func__);
1.1 provos 1372:
1373: if (!authctxt->valid)
1.14 markus 1374: fatal("%s: authctxt not valid", __func__);
1.1 provos 1375: if (ssh1_challenge == NULL)
1.14 markus 1376: fatal("%s: no ssh1_challenge", __func__);
1.1 provos 1377:
1378: blob = buffer_get_string(m, &blen);
1379: if (!monitor_allowed_key(blob, blen))
1.14 markus 1380: fatal("%s: bad key, not previously allowed", __func__);
1.1 provos 1381: if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1.14 markus 1382: fatal("%s: key type mismatch: %d", __func__, key_blobtype);
1.1 provos 1383: if ((key = key_from_blob(blob, blen)) == NULL)
1.14 markus 1384: fatal("%s: received bad key", __func__);
1.1 provos 1385: response = buffer_get_string(m, &len);
1386: if (len != 16)
1.14 markus 1387: fatal("%s: received bad response to challenge", __func__);
1.1 provos 1388: success = auth_rsa_verify_response(key, ssh1_challenge, response);
1389:
1.124 djm 1390: free(blob);
1.1 provos 1391: key_free(key);
1.124 djm 1392: free(response);
1.1 provos 1393:
1394: auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1395:
1396: /* reset state */
1397: BN_clear_free(ssh1_challenge);
1398: ssh1_challenge = NULL;
1399: monitor_reset_key_state();
1400:
1401: buffer_clear(m);
1402: buffer_put_int(m, success);
1.59 avsm 1403: mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m);
1.1 provos 1404:
1405: return (success);
1406: }
1407:
1408: int
1.59 avsm 1409: mm_answer_term(int sock, Buffer *req)
1.1 provos 1410: {
1.11 mouring 1411: extern struct monitor *pmonitor;
1.1 provos 1412: int res, status;
1413:
1.14 markus 1414: debug3("%s: tearing down sessions", __func__);
1.1 provos 1415:
1416: /* The child is terminating */
1417: session_destroy_all(&mm_session_close);
1418:
1.11 mouring 1419: while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1.9 markus 1420: if (errno != EINTR)
1421: exit(1);
1.1 provos 1422:
1423: res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1424:
1425: /* Terminate process */
1.57 deraadt 1426: exit(res);
1.1 provos 1427: }
1428:
1429: void
1.11 mouring 1430: monitor_apply_keystate(struct monitor *pmonitor)
1.1 provos 1431: {
1432: if (compat20) {
1433: set_newkeys(MODE_IN);
1434: set_newkeys(MODE_OUT);
1435: } else {
1436: packet_set_protocol_flags(child_state.ssh1protoflags);
1.15 markus 1437: packet_set_encryption_key(child_state.ssh1key,
1438: child_state.ssh1keylen, child_state.ssh1cipher);
1.124 djm 1439: free(child_state.ssh1key);
1.1 provos 1440: }
1441:
1.15 markus 1442: /* for rc4 and other stateful ciphers */
1.1 provos 1443: packet_set_keycontext(MODE_OUT, child_state.keyout);
1.124 djm 1444: free(child_state.keyout);
1.1 provos 1445: packet_set_keycontext(MODE_IN, child_state.keyin);
1.124 djm 1446: free(child_state.keyin);
1.1 provos 1447:
1448: if (!compat20) {
1449: packet_set_iv(MODE_OUT, child_state.ivout);
1.124 djm 1450: free(child_state.ivout);
1.1 provos 1451: packet_set_iv(MODE_IN, child_state.ivin);
1.124 djm 1452: free(child_state.ivin);
1.1 provos 1453: }
1454:
1455: memcpy(&incoming_stream, &child_state.incoming,
1456: sizeof(incoming_stream));
1457: memcpy(&outgoing_stream, &child_state.outgoing,
1458: sizeof(outgoing_stream));
1.3 markus 1459:
1.1 provos 1460: /* Update with new address */
1.16 djm 1461: if (options.compression)
1462: mm_init_compression(pmonitor->m_zlib);
1.123 dtucker 1463:
1464: if (options.rekey_limit || options.rekey_interval)
1465: packet_set_rekey_limits((u_int32_t)options.rekey_limit,
1466: (time_t)options.rekey_interval);
1.1 provos 1467:
1468: /* Network I/O buffers */
1469: /* XXX inefficient for large buffers, need: buffer_init_from_string */
1.102 andreas 1470: buffer_clear(packet_get_input());
1471: buffer_append(packet_get_input(), child_state.input, child_state.ilen);
1.1 provos 1472: memset(child_state.input, 0, child_state.ilen);
1.124 djm 1473: free(child_state.input);
1.1 provos 1474:
1.102 andreas 1475: buffer_clear(packet_get_output());
1476: buffer_append(packet_get_output(), child_state.output,
1477: child_state.olen);
1.1 provos 1478: memset(child_state.output, 0, child_state.olen);
1.124 djm 1479: free(child_state.output);
1.103 andreas 1480:
1481: /* Roaming */
1482: if (compat20)
1483: roam_set_bytes(child_state.sent_bytes, child_state.recv_bytes);
1.1 provos 1484: }
1485:
1.2 markus 1486: static Kex *
1.1 provos 1487: mm_get_kex(Buffer *m)
1488: {
1489: Kex *kex;
1490: void *blob;
1491: u_int bloblen;
1492:
1.75 djm 1493: kex = xcalloc(1, sizeof(*kex));
1.1 provos 1494: kex->session_id = buffer_get_string(m, &kex->session_id_len);
1.107 djm 1495: if (session_id2 == NULL ||
1496: kex->session_id_len != session_id2_len ||
1.108 djm 1497: timingsafe_bcmp(kex->session_id, session_id2, session_id2_len) != 0)
1.13 markus 1498: fatal("mm_get_get: internal error: bad session id");
1.1 provos 1499: kex->we_need = buffer_get_int(m);
1.34 markus 1500: kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1.58 djm 1501: kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
1.34 markus 1502: kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
1.69 djm 1503: kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
1.109 djm 1504: kex->kex[KEX_ECDH_SHA2] = kexecdh_server;
1.128 markus 1505: kex->kex[KEX_C25519_SHA256] = kexc25519_server;
1.1 provos 1506: kex->server = 1;
1507: kex->hostkey_type = buffer_get_int(m);
1508: kex->kex_type = buffer_get_int(m);
1509: blob = buffer_get_string(m, &bloblen);
1510: buffer_init(&kex->my);
1511: buffer_append(&kex->my, blob, bloblen);
1.124 djm 1512: free(blob);
1.1 provos 1513: blob = buffer_get_string(m, &bloblen);
1514: buffer_init(&kex->peer);
1515: buffer_append(&kex->peer, blob, bloblen);
1.124 djm 1516: free(blob);
1.1 provos 1517: kex->done = 1;
1518: kex->flags = buffer_get_int(m);
1519: kex->client_version_string = buffer_get_string(m, NULL);
1520: kex->server_version_string = buffer_get_string(m, NULL);
1.105 djm 1521: kex->load_host_public_key=&get_hostkey_public_by_type;
1522: kex->load_host_private_key=&get_hostkey_private_by_type;
1.1 provos 1523: kex->host_key_index=&get_hostkey_index;
1.127 markus 1524: kex->sign = sshd_hostkey_sign;
1.1 provos 1525:
1526: return (kex);
1527: }
1528:
1529: /* This function requries careful sanity checking */
1530:
1531: void
1.11 mouring 1532: mm_get_keystate(struct monitor *pmonitor)
1.1 provos 1533: {
1534: Buffer m;
1535: u_char *blob, *p;
1536: u_int bloblen, plen;
1.37 markus 1537: u_int32_t seqnr, packets;
1.99 markus 1538: u_int64_t blocks, bytes;
1.1 provos 1539:
1.14 markus 1540: debug3("%s: Waiting for new keys", __func__);
1.1 provos 1541:
1542: buffer_init(&m);
1.11 mouring 1543: mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1.1 provos 1544: if (!compat20) {
1545: child_state.ssh1protoflags = buffer_get_int(&m);
1546: child_state.ssh1cipher = buffer_get_int(&m);
1.15 markus 1547: child_state.ssh1key = buffer_get_string(&m,
1548: &child_state.ssh1keylen);
1.1 provos 1549: child_state.ivout = buffer_get_string(&m,
1550: &child_state.ivoutlen);
1551: child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1552: goto skip;
1553: } else {
1554: /* Get the Kex for rekeying */
1.11 mouring 1555: *pmonitor->m_pkex = mm_get_kex(&m);
1.1 provos 1556: }
1557:
1558: blob = buffer_get_string(&m, &bloblen);
1559: current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1.124 djm 1560: free(blob);
1.1 provos 1561:
1.14 markus 1562: debug3("%s: Waiting for second key", __func__);
1.1 provos 1563: blob = buffer_get_string(&m, &bloblen);
1564: current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1.124 djm 1565: free(blob);
1.3 markus 1566:
1.1 provos 1567: /* Now get sequence numbers for the packets */
1.37 markus 1568: seqnr = buffer_get_int(&m);
1569: blocks = buffer_get_int64(&m);
1570: packets = buffer_get_int(&m);
1.99 markus 1571: bytes = buffer_get_int64(&m);
1572: packet_set_state(MODE_OUT, seqnr, blocks, packets, bytes);
1.37 markus 1573: seqnr = buffer_get_int(&m);
1574: blocks = buffer_get_int64(&m);
1575: packets = buffer_get_int(&m);
1.99 markus 1576: bytes = buffer_get_int64(&m);
1577: packet_set_state(MODE_IN, seqnr, blocks, packets, bytes);
1.1 provos 1578:
1579: skip:
1580: /* Get the key context */
1581: child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1582: child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1583:
1.14 markus 1584: debug3("%s: Getting compression state", __func__);
1.1 provos 1585: /* Get compression state */
1586: p = buffer_get_string(&m, &plen);
1587: if (plen != sizeof(child_state.outgoing))
1.14 markus 1588: fatal("%s: bad request size", __func__);
1.1 provos 1589: memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1.124 djm 1590: free(p);
1.1 provos 1591:
1592: p = buffer_get_string(&m, &plen);
1593: if (plen != sizeof(child_state.incoming))
1.14 markus 1594: fatal("%s: bad request size", __func__);
1.1 provos 1595: memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1.124 djm 1596: free(p);
1.1 provos 1597:
1598: /* Network I/O buffers */
1.14 markus 1599: debug3("%s: Getting Network I/O buffers", __func__);
1.1 provos 1600: child_state.input = buffer_get_string(&m, &child_state.ilen);
1601: child_state.output = buffer_get_string(&m, &child_state.olen);
1.103 andreas 1602:
1603: /* Roaming */
1604: if (compat20) {
1605: child_state.sent_bytes = buffer_get_int64(&m);
1606: child_state.recv_bytes = buffer_get_int64(&m);
1607: }
1.1 provos 1608:
1609: buffer_free(&m);
1610: }
1611:
1612:
1613: /* Allocation functions for zlib */
1614: void *
1615: mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1616: {
1.30 markus 1617: size_t len = (size_t) size * ncount;
1.1 provos 1618: void *address;
1619:
1.23 millert 1620: if (len == 0 || ncount > SIZE_T_MAX / size)
1.18 deraadt 1621: fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1622:
1623: address = mm_malloc(mm, len);
1.1 provos 1624:
1625: return (address);
1626: }
1627:
1628: void
1629: mm_zfree(struct mm_master *mm, void *address)
1630: {
1631: mm_free(mm, address);
1632: }
1633:
1634: void
1635: mm_init_compression(struct mm_master *mm)
1636: {
1637: outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1638: outgoing_stream.zfree = (free_func)mm_zfree;
1639: outgoing_stream.opaque = mm;
1640:
1641: incoming_stream.zalloc = (alloc_func)mm_zalloc;
1642: incoming_stream.zfree = (free_func)mm_zfree;
1643: incoming_stream.opaque = mm;
1644: }
1645:
1646: /* XXX */
1647:
1648: #define FD_CLOSEONEXEC(x) do { \
1.111 djm 1649: if (fcntl(x, F_SETFD, FD_CLOEXEC) == -1) \
1.1 provos 1650: fatal("fcntl(%d, F_SETFD)", x); \
1651: } while (0)
1652:
1.2 markus 1653: static void
1.114 djm 1654: monitor_openfds(struct monitor *mon, int do_logfds)
1.3 markus 1655: {
1.114 djm 1656: int pair[2];
1657:
1.1 provos 1658: if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1.114 djm 1659: fatal("%s: socketpair: %s", __func__, strerror(errno));
1.1 provos 1660: FD_CLOSEONEXEC(pair[0]);
1661: FD_CLOSEONEXEC(pair[1]);
1.114 djm 1662: mon->m_recvfd = pair[0];
1663: mon->m_sendfd = pair[1];
1664:
1665: if (do_logfds) {
1666: if (pipe(pair) == -1)
1667: fatal("%s: pipe: %s", __func__, strerror(errno));
1668: FD_CLOSEONEXEC(pair[0]);
1669: FD_CLOSEONEXEC(pair[1]);
1670: mon->m_log_recvfd = pair[0];
1671: mon->m_log_sendfd = pair[1];
1672: } else
1673: mon->m_log_recvfd = mon->m_log_sendfd = -1;
1.1 provos 1674: }
1675:
1676: #define MM_MEMSIZE 65536
1677:
1678: struct monitor *
1679: monitor_init(void)
1680: {
1681: struct monitor *mon;
1682:
1.75 djm 1683: mon = xcalloc(1, sizeof(*mon));
1.1 provos 1684:
1.114 djm 1685: monitor_openfds(mon, 1);
1.1 provos 1686:
1687: /* Used to share zlib space across processes */
1.16 djm 1688: if (options.compression) {
1689: mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1690: mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
1.1 provos 1691:
1.16 djm 1692: /* Compression needs to share state across borders */
1693: mm_init_compression(mon->m_zlib);
1694: }
1.1 provos 1695:
1696: return mon;
1697: }
1698:
1699: void
1700: monitor_reinit(struct monitor *mon)
1701: {
1.114 djm 1702: monitor_openfds(mon, 0);
1.1 provos 1703: }
1.46 markus 1704:
1705: #ifdef GSSAPI
1706: int
1.59 avsm 1707: mm_answer_gss_setup_ctx(int sock, Buffer *m)
1.46 markus 1708: {
1.59 avsm 1709: gss_OID_desc goid;
1.46 markus 1710: OM_uint32 major;
1711: u_int len;
1712:
1.59 avsm 1713: goid.elements = buffer_get_string(m, &len);
1714: goid.length = len;
1.46 markus 1715:
1.59 avsm 1716: major = ssh_gssapi_server_ctx(&gsscontext, &goid);
1.46 markus 1717:
1.124 djm 1718: free(goid.elements);
1.46 markus 1719:
1720: buffer_clear(m);
1721: buffer_put_int(m, major);
1722:
1.64 stevesk 1723: mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
1.46 markus 1724:
1725: /* Now we have a context, enable the step */
1726: monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1727:
1728: return (0);
1729: }
1730:
1731: int
1.59 avsm 1732: mm_answer_gss_accept_ctx(int sock, Buffer *m)
1.46 markus 1733: {
1734: gss_buffer_desc in;
1735: gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
1.64 stevesk 1736: OM_uint32 major, minor;
1.46 markus 1737: OM_uint32 flags = 0; /* GSI needs this */
1.47 deraadt 1738: u_int len;
1.46 markus 1739:
1.47 deraadt 1740: in.value = buffer_get_string(m, &len);
1741: in.length = len;
1.46 markus 1742: major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1.124 djm 1743: free(in.value);
1.46 markus 1744:
1745: buffer_clear(m);
1746: buffer_put_int(m, major);
1747: buffer_put_string(m, out.value, out.length);
1748: buffer_put_int(m, flags);
1.59 avsm 1749: mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
1.46 markus 1750:
1751: gss_release_buffer(&minor, &out);
1752:
1.64 stevesk 1753: if (major == GSS_S_COMPLETE) {
1.46 markus 1754: monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
1755: monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1.52 markus 1756: monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
1.46 markus 1757: }
1758: return (0);
1759: }
1760:
1761: int
1.59 avsm 1762: mm_answer_gss_checkmic(int sock, Buffer *m)
1.52 markus 1763: {
1764: gss_buffer_desc gssbuf, mic;
1765: OM_uint32 ret;
1766: u_int len;
1.54 djm 1767:
1.52 markus 1768: gssbuf.value = buffer_get_string(m, &len);
1769: gssbuf.length = len;
1770: mic.value = buffer_get_string(m, &len);
1771: mic.length = len;
1.54 djm 1772:
1.52 markus 1773: ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
1.54 djm 1774:
1.124 djm 1775: free(gssbuf.value);
1776: free(mic.value);
1.54 djm 1777:
1.52 markus 1778: buffer_clear(m);
1779: buffer_put_int(m, ret);
1.54 djm 1780:
1.59 avsm 1781: mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
1.54 djm 1782:
1.52 markus 1783: if (!GSS_ERROR(ret))
1784: monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1.54 djm 1785:
1.52 markus 1786: return (0);
1787: }
1788:
1789: int
1.59 avsm 1790: mm_answer_gss_userok(int sock, Buffer *m)
1.46 markus 1791: {
1792: int authenticated;
1793:
1794: authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1795:
1796: buffer_clear(m);
1797: buffer_put_int(m, authenticated);
1798:
1799: debug3("%s: sending result %d", __func__, authenticated);
1.59 avsm 1800: mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
1.46 markus 1801:
1.64 stevesk 1802: auth_method = "gssapi-with-mic";
1.46 markus 1803:
1804: /* Monitor loop will terminate if authenticated */
1805: return (authenticated);
1806: }
1807: #endif /* GSSAPI */
1.100 djm 1808:
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