Annotation of src/usr.bin/ssh/monitor.c, Revision 1.134
1.134 ! djm 1: /* $OpenBSD: monitor.c,v 1.133 2014/05/03 17:20:34 markus 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:
1.132 markus 35: #ifdef WITH_OPENSSL
1.78 stevesk 36: #include <openssl/dh.h>
1.132 markus 37: #endif
1.78 stevesk 38:
1.81 stevesk 39: #include <errno.h>
1.80 stevesk 40: #include <fcntl.h>
1.65 stevesk 41: #include <paths.h>
1.114 djm 42: #include <poll.h>
1.78 stevesk 43: #include <pwd.h>
1.68 stevesk 44: #include <signal.h>
1.134 ! djm 45: #include <stdarg.h>
! 46: #include <stdio.h>
1.84 stevesk 47: #include <stdlib.h>
1.82 stevesk 48: #include <string.h>
1.1 provos 49:
1.114 djm 50: #include "atomicio.h"
1.85 deraadt 51: #include "xmalloc.h"
1.1 provos 52: #include "ssh.h"
1.85 deraadt 53: #include "key.h"
54: #include "buffer.h"
55: #include "hostfile.h"
1.1 provos 56: #include "auth.h"
1.85 deraadt 57: #include "cipher.h"
1.1 provos 58: #include "kex.h"
59: #include "dh.h"
1.88 miod 60: #include <zlib.h>
1.1 provos 61: #include "packet.h"
62: #include "auth-options.h"
63: #include "sshpty.h"
64: #include "channels.h"
65: #include "session.h"
66: #include "sshlogin.h"
67: #include "canohost.h"
68: #include "log.h"
69: #include "servconf.h"
70: #include "monitor.h"
71: #include "monitor_mm.h"
1.85 deraadt 72: #ifdef GSSAPI
73: #include "ssh-gss.h"
74: #endif
1.1 provos 75: #include "monitor_wrap.h"
76: #include "monitor_fdpass.h"
77: #include "misc.h"
78: #include "compat.h"
79: #include "ssh2.h"
1.104 andreas 80: #include "roaming.h"
1.127 markus 81: #include "authfd.h"
1.1 provos 82:
1.46 markus 83: #ifdef GSSAPI
84: static Gssctxt *gsscontext = NULL;
85: #endif
86:
1.1 provos 87: /* Imports */
88: extern ServerOptions options;
89: extern u_int utmp_len;
90: extern Newkeys *current_keys[];
91: extern z_stream incoming_stream;
92: extern z_stream outgoing_stream;
93: extern u_char session_id[];
94: extern Buffer auth_debug;
95: extern int auth_debug_init;
1.61 dtucker 96: extern Buffer loginmsg;
1.1 provos 97:
98: /* State exported from the child */
99:
100: struct {
101: z_stream incoming;
102: z_stream outgoing;
103: u_char *keyin;
104: u_int keyinlen;
105: u_char *keyout;
106: u_int keyoutlen;
107: u_char *ivin;
108: u_int ivinlen;
109: u_char *ivout;
110: u_int ivoutlen;
1.15 markus 111: u_char *ssh1key;
112: u_int ssh1keylen;
1.1 provos 113: int ssh1cipher;
114: int ssh1protoflags;
115: u_char *input;
116: u_int ilen;
117: u_char *output;
118: u_int olen;
1.103 andreas 119: u_int64_t sent_bytes;
120: u_int64_t recv_bytes;
1.1 provos 121: } child_state;
122:
1.43 markus 123: /* Functions on the monitor that answer unprivileged requests */
1.1 provos 124:
125: int mm_answer_moduli(int, Buffer *);
126: int mm_answer_sign(int, Buffer *);
127: int mm_answer_pwnamallow(int, Buffer *);
1.10 djm 128: int mm_answer_auth2_read_banner(int, Buffer *);
1.1 provos 129: int mm_answer_authserv(int, Buffer *);
130: int mm_answer_authpassword(int, Buffer *);
131: int mm_answer_bsdauthquery(int, Buffer *);
132: int mm_answer_bsdauthrespond(int, Buffer *);
133: int mm_answer_skeyquery(int, Buffer *);
134: int mm_answer_skeyrespond(int, Buffer *);
135: int mm_answer_keyallowed(int, Buffer *);
136: int mm_answer_keyverify(int, Buffer *);
137: int mm_answer_pty(int, Buffer *);
138: int mm_answer_pty_cleanup(int, Buffer *);
139: int mm_answer_term(int, Buffer *);
140: int mm_answer_rsa_keyallowed(int, Buffer *);
141: int mm_answer_rsa_challenge(int, Buffer *);
142: int mm_answer_rsa_response(int, Buffer *);
143: int mm_answer_sesskey(int, Buffer *);
144: int mm_answer_sessid(int, Buffer *);
145:
1.46 markus 146: #ifdef GSSAPI
147: int mm_answer_gss_setup_ctx(int, Buffer *);
148: int mm_answer_gss_accept_ctx(int, Buffer *);
149: int mm_answer_gss_userok(int, Buffer *);
1.52 markus 150: int mm_answer_gss_checkmic(int, Buffer *);
1.46 markus 151: #endif
1.25 itojun 152:
1.114 djm 153: static int monitor_read_log(struct monitor *);
154:
1.1 provos 155: static Authctxt *authctxt;
1.132 markus 156:
157: #ifdef WITH_SSH1
1.1 provos 158: static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
1.132 markus 159: #endif
1.1 provos 160:
161: /* local state for key verify */
162: static u_char *key_blob = NULL;
163: static u_int key_bloblen = 0;
164: static int key_blobtype = MM_NOKEY;
1.26 markus 165: static char *hostbased_cuser = NULL;
166: static char *hostbased_chost = NULL;
1.1 provos 167: static char *auth_method = "unknown";
1.119 djm 168: static char *auth_submethod = NULL;
1.44 markus 169: static u_int session_id2_len = 0;
1.13 markus 170: static u_char *session_id2 = NULL;
1.40 markus 171: static pid_t monitor_child_pid;
1.1 provos 172:
173: struct mon_table {
174: enum monitor_reqtype type;
175: int flags;
176: int (*f)(int, Buffer *);
177: };
178:
179: #define MON_ISAUTH 0x0004 /* Required for Authentication */
180: #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
181: #define MON_ONCE 0x0010 /* Disable after calling */
1.77 dtucker 182: #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */
1.1 provos 183:
184: #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
185:
186: #define MON_PERMIT 0x1000 /* Request is permitted */
187:
188: struct mon_table mon_dispatch_proto20[] = {
1.132 markus 189: #ifdef WITH_OPENSSL
1.1 provos 190: {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
1.132 markus 191: #endif
1.1 provos 192: {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
193: {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
194: {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
1.10 djm 195: {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
1.1 provos 196: {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
197: {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
1.66 stevesk 198: {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
1.1 provos 199: {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
200: {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
1.46 markus 201: #ifdef GSSAPI
202: {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
203: {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
204: {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
1.52 markus 205: {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
1.46 markus 206: #endif
1.1 provos 207: {0, 0, NULL}
208: };
209:
210: struct mon_table mon_dispatch_postauth20[] = {
1.132 markus 211: #ifdef WITH_OPENSSL
1.1 provos 212: {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
1.132 markus 213: #endif
1.1 provos 214: {MONITOR_REQ_SIGN, 0, mm_answer_sign},
215: {MONITOR_REQ_PTY, 0, mm_answer_pty},
216: {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
217: {MONITOR_REQ_TERM, 0, mm_answer_term},
218: {0, 0, NULL}
219: };
220:
221: struct mon_table mon_dispatch_proto15[] = {
1.132 markus 222: #ifdef WITH_SSH1
1.1 provos 223: {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
224: {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
225: {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
226: {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
1.77 dtucker 227: {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed},
228: {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed},
1.1 provos 229: {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
230: {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
231: {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
1.66 stevesk 232: {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
1.132 markus 233: #endif
1.1 provos 234: {0, 0, NULL}
235: };
236:
237: struct mon_table mon_dispatch_postauth15[] = {
1.132 markus 238: #ifdef WITH_SSH1
1.1 provos 239: {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
240: {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
241: {MONITOR_REQ_TERM, 0, mm_answer_term},
1.132 markus 242: #endif
1.1 provos 243: {0, 0, NULL}
244: };
245:
246: struct mon_table *mon_dispatch;
247:
248: /* Specifies if a certain message is allowed at the moment */
249:
250: static void
251: monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
252: {
253: while (ent->f != NULL) {
254: if (ent->type == type) {
255: ent->flags &= ~MON_PERMIT;
256: ent->flags |= permit ? MON_PERMIT : 0;
257: return;
258: }
259: ent++;
260: }
261: }
262:
263: static void
264: monitor_permit_authentications(int permit)
265: {
266: struct mon_table *ent = mon_dispatch;
267:
268: while (ent->f != NULL) {
269: if (ent->flags & MON_AUTH) {
270: ent->flags &= ~MON_PERMIT;
271: ent->flags |= permit ? MON_PERMIT : 0;
272: }
273: ent++;
274: }
275: }
276:
1.50 markus 277: void
278: monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
1.1 provos 279: {
280: struct mon_table *ent;
1.119 djm 281: int authenticated = 0, partial = 0;
1.1 provos 282:
283: debug3("preauth child monitor started");
284:
1.114 djm 285: close(pmonitor->m_recvfd);
286: close(pmonitor->m_log_sendfd);
287: pmonitor->m_log_sendfd = pmonitor->m_recvfd = -1;
288:
1.50 markus 289: authctxt = _authctxt;
290: memset(authctxt, 0, sizeof(*authctxt));
291:
1.1 provos 292: if (compat20) {
293: mon_dispatch = mon_dispatch_proto20;
294:
295: /* Permit requests for moduli and signatures */
296: monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
297: monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
298: } else {
299: mon_dispatch = mon_dispatch_proto15;
300:
301: monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
302: }
303:
304: /* The first few requests do not require asynchronous access */
305: while (!authenticated) {
1.119 djm 306: partial = 0;
1.77 dtucker 307: auth_method = "unknown";
1.119 djm 308: auth_submethod = NULL;
1.89 markus 309: authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1);
1.118 djm 310:
311: /* Special handling for multiple required authentications */
312: if (options.num_auth_methods != 0) {
313: if (!compat20)
314: fatal("AuthenticationMethods is not supported"
315: "with SSH protocol 1");
316: if (authenticated &&
317: !auth2_update_methods_lists(authctxt,
1.122 markus 318: auth_method, auth_submethod)) {
1.118 djm 319: debug3("%s: method %s: partial", __func__,
320: auth_method);
321: authenticated = 0;
1.119 djm 322: partial = 1;
1.118 djm 323: }
324: }
325:
1.1 provos 326: if (authenticated) {
327: if (!(ent->flags & MON_AUTHDECIDE))
328: fatal("%s: unexpected authentication from %d",
1.14 markus 329: __func__, ent->type);
1.1 provos 330: if (authctxt->pw->pw_uid == 0 &&
331: !auth_root_allowed(auth_method))
332: authenticated = 0;
333: }
1.77 dtucker 334: if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) {
1.119 djm 335: auth_log(authctxt, authenticated, partial,
1.125 djm 336: auth_method, auth_submethod);
1.1 provos 337: if (!authenticated)
338: authctxt->failures++;
339: }
340: }
341:
342: if (!authctxt->valid)
1.14 markus 343: fatal("%s: authenticated invalid user", __func__);
1.77 dtucker 344: if (strcmp(auth_method, "unknown") == 0)
345: fatal("%s: authentication method name unknown", __func__);
1.1 provos 346:
347: debug("%s: %s has been authenticated by privileged process",
1.14 markus 348: __func__, authctxt->user);
1.1 provos 349:
1.11 mouring 350: mm_get_keystate(pmonitor);
1.120 markus 351:
352: /* Drain any buffered messages from the child */
353: while (pmonitor->m_log_recvfd != -1 && monitor_read_log(pmonitor) == 0)
354: ;
1.114 djm 355:
356: close(pmonitor->m_sendfd);
357: close(pmonitor->m_log_recvfd);
358: pmonitor->m_sendfd = pmonitor->m_log_recvfd = -1;
1.1 provos 359: }
360:
1.40 markus 361: static void
362: monitor_set_child_handler(pid_t pid)
363: {
364: monitor_child_pid = pid;
365: }
366:
367: static void
1.59 avsm 368: monitor_child_handler(int sig)
1.40 markus 369: {
1.59 avsm 370: kill(monitor_child_pid, sig);
1.40 markus 371: }
372:
1.1 provos 373: void
1.11 mouring 374: monitor_child_postauth(struct monitor *pmonitor)
1.1 provos 375: {
1.114 djm 376: close(pmonitor->m_recvfd);
377: pmonitor->m_recvfd = -1;
378:
1.40 markus 379: monitor_set_child_handler(pmonitor->m_pid);
380: signal(SIGHUP, &monitor_child_handler);
381: signal(SIGTERM, &monitor_child_handler);
1.91 djm 382: signal(SIGINT, &monitor_child_handler);
1.40 markus 383:
1.1 provos 384: if (compat20) {
385: mon_dispatch = mon_dispatch_postauth20;
386:
387: /* Permit requests for moduli and signatures */
388: monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
389: monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
390: monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
391: } else {
392: mon_dispatch = mon_dispatch_postauth15;
393: monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
394: }
395: if (!no_pty_flag) {
396: monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
397: monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
398: }
399:
400: for (;;)
1.11 mouring 401: monitor_read(pmonitor, mon_dispatch, NULL);
1.1 provos 402: }
403:
404: void
1.11 mouring 405: monitor_sync(struct monitor *pmonitor)
1.1 provos 406: {
1.16 djm 407: if (options.compression) {
408: /* The member allocation is not visible, so sync it */
409: mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
410: }
1.1 provos 411: }
412:
1.114 djm 413: static int
414: monitor_read_log(struct monitor *pmonitor)
415: {
416: Buffer logmsg;
417: u_int len, level;
418: char *msg;
419:
420: buffer_init(&logmsg);
421:
422: /* Read length */
423: buffer_append_space(&logmsg, 4);
424: if (atomicio(read, pmonitor->m_log_recvfd,
425: buffer_ptr(&logmsg), buffer_len(&logmsg)) != buffer_len(&logmsg)) {
426: if (errno == EPIPE) {
1.116 djm 427: buffer_free(&logmsg);
1.114 djm 428: debug("%s: child log fd closed", __func__);
429: close(pmonitor->m_log_recvfd);
430: pmonitor->m_log_recvfd = -1;
431: return -1;
432: }
433: fatal("%s: log fd read: %s", __func__, strerror(errno));
434: }
435: len = buffer_get_int(&logmsg);
436: if (len <= 4 || len > 8192)
437: fatal("%s: invalid log message length %u", __func__, len);
438:
439: /* Read severity, message */
440: buffer_clear(&logmsg);
441: buffer_append_space(&logmsg, len);
442: if (atomicio(read, pmonitor->m_log_recvfd,
443: buffer_ptr(&logmsg), buffer_len(&logmsg)) != buffer_len(&logmsg))
444: fatal("%s: log fd read: %s", __func__, strerror(errno));
445:
446: /* Log it */
447: level = buffer_get_int(&logmsg);
448: msg = buffer_get_string(&logmsg, NULL);
449: if (log_level_name(level) == NULL)
450: fatal("%s: invalid log level %u (corrupted message?)",
451: __func__, level);
452: do_log2(level, "%s [preauth]", msg);
453:
454: buffer_free(&logmsg);
1.124 djm 455: free(msg);
1.114 djm 456:
457: return 0;
458: }
459:
1.1 provos 460: int
1.11 mouring 461: monitor_read(struct monitor *pmonitor, struct mon_table *ent,
1.1 provos 462: struct mon_table **pent)
463: {
464: Buffer m;
465: int ret;
466: u_char type;
1.114 djm 467: struct pollfd pfd[2];
468:
469: for (;;) {
1.130 tedu 470: memset(&pfd, 0, sizeof(pfd));
1.114 djm 471: pfd[0].fd = pmonitor->m_sendfd;
472: pfd[0].events = POLLIN;
473: pfd[1].fd = pmonitor->m_log_recvfd;
474: pfd[1].events = pfd[1].fd == -1 ? 0 : POLLIN;
1.115 djm 475: if (poll(pfd, pfd[1].fd == -1 ? 1 : 2, -1) == -1) {
476: if (errno == EINTR || errno == EAGAIN)
477: continue;
1.114 djm 478: fatal("%s: poll: %s", __func__, strerror(errno));
1.115 djm 479: }
1.114 djm 480: if (pfd[1].revents) {
481: /*
482: * Drain all log messages before processing next
483: * monitor request.
484: */
485: monitor_read_log(pmonitor);
486: continue;
487: }
488: if (pfd[0].revents)
489: break; /* Continues below */
490: }
1.1 provos 491:
492: buffer_init(&m);
493:
1.11 mouring 494: mm_request_receive(pmonitor->m_sendfd, &m);
1.1 provos 495: type = buffer_get_char(&m);
496:
1.14 markus 497: debug3("%s: checking request %d", __func__, type);
1.1 provos 498:
499: while (ent->f != NULL) {
500: if (ent->type == type)
501: break;
502: ent++;
503: }
504:
505: if (ent->f != NULL) {
506: if (!(ent->flags & MON_PERMIT))
1.14 markus 507: fatal("%s: unpermitted request %d", __func__,
1.1 provos 508: type);
1.11 mouring 509: ret = (*ent->f)(pmonitor->m_sendfd, &m);
1.1 provos 510: buffer_free(&m);
511:
512: /* The child may use this request only once, disable it */
513: if (ent->flags & MON_ONCE) {
1.14 markus 514: debug2("%s: %d used once, disabling now", __func__,
1.1 provos 515: type);
516: ent->flags &= ~MON_PERMIT;
517: }
518:
519: if (pent != NULL)
520: *pent = ent;
1.3 markus 521:
1.1 provos 522: return ret;
523: }
524:
1.14 markus 525: fatal("%s: unsupported request: %d", __func__, type);
1.1 provos 526:
527: /* NOTREACHED */
528: return (-1);
529: }
530:
531: /* allowed key state */
532: static int
533: monitor_allowed_key(u_char *blob, u_int bloblen)
534: {
535: /* make sure key is allowed */
536: if (key_blob == NULL || key_bloblen != bloblen ||
1.108 djm 537: timingsafe_bcmp(key_blob, blob, key_bloblen))
1.1 provos 538: return (0);
539: return (1);
540: }
541:
542: static void
543: monitor_reset_key_state(void)
544: {
545: /* reset state */
1.124 djm 546: free(key_blob);
547: free(hostbased_cuser);
548: free(hostbased_chost);
1.1 provos 549: key_blob = NULL;
550: key_bloblen = 0;
551: key_blobtype = MM_NOKEY;
552: hostbased_cuser = NULL;
553: hostbased_chost = NULL;
554: }
555:
1.132 markus 556: #ifdef WITH_OPENSSL
1.1 provos 557: int
1.59 avsm 558: mm_answer_moduli(int sock, Buffer *m)
1.1 provos 559: {
560: DH *dh;
561: int min, want, max;
562:
563: min = buffer_get_int(m);
564: want = buffer_get_int(m);
565: max = buffer_get_int(m);
566:
567: debug3("%s: got parameters: %d %d %d",
1.14 markus 568: __func__, min, want, max);
1.1 provos 569: /* We need to check here, too, in case the child got corrupted */
570: if (max < min || want < min || max < want)
571: fatal("%s: bad parameters: %d %d %d",
1.14 markus 572: __func__, min, want, max);
1.1 provos 573:
574: buffer_clear(m);
575:
576: dh = choose_dh(min, want, max);
577: if (dh == NULL) {
578: buffer_put_char(m, 0);
579: return (0);
580: } else {
581: /* Send first bignum */
582: buffer_put_char(m, 1);
583: buffer_put_bignum2(m, dh->p);
584: buffer_put_bignum2(m, dh->g);
1.3 markus 585:
1.1 provos 586: DH_free(dh);
587: }
1.59 avsm 588: mm_request_send(sock, MONITOR_ANS_MODULI, m);
1.1 provos 589: return (0);
590: }
1.132 markus 591: #endif
1.1 provos 592:
1.127 markus 593: extern AuthenticationConnection *auth_conn;
594:
1.1 provos 595: int
1.59 avsm 596: mm_answer_sign(int sock, Buffer *m)
1.1 provos 597: {
598: Key *key;
599: u_char *p;
600: u_char *signature;
601: u_int siglen, datlen;
602: int keyid;
1.3 markus 603:
1.14 markus 604: debug3("%s", __func__);
1.1 provos 605:
1.3 markus 606: keyid = buffer_get_int(m);
607: p = buffer_get_string(m, &datlen);
1.1 provos 608:
1.69 djm 609: /*
1.110 djm 610: * Supported KEX types use SHA1 (20 bytes), SHA256 (32 bytes),
611: * SHA384 (48 bytes) and SHA512 (64 bytes).
1.69 djm 612: */
1.110 djm 613: if (datlen != 20 && datlen != 32 && datlen != 48 && datlen != 64)
1.19 deraadt 614: fatal("%s: data length incorrect: %u", __func__, datlen);
1.1 provos 615:
1.13 markus 616: /* save session id, it will be passed on the first call */
617: if (session_id2_len == 0) {
618: session_id2_len = datlen;
619: session_id2 = xmalloc(session_id2_len);
620: memcpy(session_id2, p, session_id2_len);
621: }
622:
1.127 markus 623: if ((key = get_hostkey_by_index(keyid)) != NULL) {
624: if (key_sign(key, &signature, &siglen, p, datlen) < 0)
625: fatal("%s: key_sign failed", __func__);
626: } else if ((key = get_hostkey_public_by_index(keyid)) != NULL &&
627: auth_conn != NULL) {
628: if (ssh_agent_sign(auth_conn, key, &signature, &siglen, p,
629: datlen) < 0)
630: fatal("%s: ssh_agent_sign failed", __func__);
631: } else
1.14 markus 632: fatal("%s: no hostkey from index %d", __func__, keyid);
1.1 provos 633:
1.19 deraadt 634: debug3("%s: signature %p(%u)", __func__, signature, siglen);
1.1 provos 635:
636: buffer_clear(m);
637: buffer_put_string(m, signature, siglen);
638:
1.124 djm 639: free(p);
640: free(signature);
1.1 provos 641:
1.59 avsm 642: mm_request_send(sock, MONITOR_ANS_SIGN, m);
1.1 provos 643:
644: /* Turn on permissions for getpwnam */
645: monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
646:
647: return (0);
648: }
649:
650: /* Retrieves the password entry and also checks if the user is permitted */
651:
652: int
1.59 avsm 653: mm_answer_pwnamallow(int sock, Buffer *m)
1.1 provos 654: {
1.60 dtucker 655: char *username;
1.1 provos 656: struct passwd *pwent;
657: int allowed = 0;
1.113 djm 658: u_int i;
1.3 markus 659:
1.14 markus 660: debug3("%s", __func__);
1.1 provos 661:
662: if (authctxt->attempt++ != 0)
1.14 markus 663: fatal("%s: multiple attempts for getpwnam", __func__);
1.1 provos 664:
1.60 dtucker 665: username = buffer_get_string(m, NULL);
1.1 provos 666:
1.60 dtucker 667: pwent = getpwnamallow(username);
1.1 provos 668:
1.60 dtucker 669: authctxt->user = xstrdup(username);
670: setproctitle("%s [priv]", pwent ? username : "unknown");
1.124 djm 671: free(username);
1.1 provos 672:
673: buffer_clear(m);
674:
675: if (pwent == NULL) {
676: buffer_put_char(m, 0);
1.53 djm 677: authctxt->pw = fakepw();
1.1 provos 678: goto out;
679: }
680:
681: allowed = 1;
1.4 markus 682: authctxt->pw = pwent;
1.1 provos 683: authctxt->valid = 1;
684:
685: buffer_put_char(m, 1);
686: buffer_put_string(m, pwent, sizeof(struct passwd));
687: buffer_put_cstring(m, pwent->pw_name);
688: buffer_put_cstring(m, "*");
689: buffer_put_cstring(m, pwent->pw_gecos);
690: buffer_put_cstring(m, pwent->pw_class);
691: buffer_put_cstring(m, pwent->pw_dir);
692: buffer_put_cstring(m, pwent->pw_shell);
1.94 dtucker 693:
694: out:
1.90 dtucker 695: buffer_put_string(m, &options, sizeof(options));
1.112 djm 696:
697: #define M_CP_STROPT(x) do { \
698: if (options.x != NULL) \
699: buffer_put_cstring(m, options.x); \
700: } while (0)
1.113 djm 701: #define M_CP_STRARRAYOPT(x, nx) do { \
702: for (i = 0; i < options.nx; i++) \
703: buffer_put_cstring(m, options.x[i]); \
704: } while (0)
1.112 djm 705: /* See comment in servconf.h */
706: COPY_MATCH_STRING_OPTS();
707: #undef M_CP_STROPT
1.113 djm 708: #undef M_CP_STRARRAYOPT
1.118 djm 709:
710: /* Create valid auth method lists */
711: if (compat20 && auth2_setup_methods_lists(authctxt) != 0) {
712: /*
713: * The monitor will continue long enough to let the child
714: * run to it's packet_disconnect(), but it must not allow any
715: * authentication to succeed.
716: */
717: debug("%s: no valid authentication method lists", __func__);
718: }
719:
1.14 markus 720: debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
1.59 avsm 721: mm_request_send(sock, MONITOR_ANS_PWNAM, m);
1.1 provos 722:
723: /* For SSHv1 allow authentication now */
724: if (!compat20)
725: monitor_permit_authentications(1);
1.10 djm 726: else {
1.1 provos 727: /* Allow service/style information on the auth context */
728: monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
1.10 djm 729: monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
730: }
731:
732: return (0);
733: }
734:
1.59 avsm 735: int mm_answer_auth2_read_banner(int sock, Buffer *m)
1.10 djm 736: {
737: char *banner;
738:
739: buffer_clear(m);
740: banner = auth2_read_banner();
741: buffer_put_cstring(m, banner != NULL ? banner : "");
1.59 avsm 742: mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
1.124 djm 743: free(banner);
1.1 provos 744:
745: return (0);
746: }
747:
748: int
1.59 avsm 749: mm_answer_authserv(int sock, Buffer *m)
1.1 provos 750: {
751: monitor_permit_authentications(1);
752:
753: authctxt->service = buffer_get_string(m, NULL);
754: authctxt->style = buffer_get_string(m, NULL);
1.6 stevesk 755: debug3("%s: service=%s, style=%s",
1.14 markus 756: __func__, authctxt->service, authctxt->style);
1.6 stevesk 757:
1.1 provos 758: if (strlen(authctxt->style) == 0) {
1.124 djm 759: free(authctxt->style);
1.1 provos 760: authctxt->style = NULL;
761: }
762:
763: return (0);
764: }
765:
766: int
1.59 avsm 767: mm_answer_authpassword(int sock, Buffer *m)
1.1 provos 768: {
769: static int call_count;
770: char *passwd;
1.22 stevesk 771: int authenticated;
772: u_int plen;
1.1 provos 773:
774: passwd = buffer_get_string(m, &plen);
775: /* Only authenticate if the context is valid */
1.12 markus 776: authenticated = options.password_authentication &&
1.48 markus 777: auth_password(authctxt, passwd);
1.131 djm 778: explicit_bzero(passwd, strlen(passwd));
1.124 djm 779: free(passwd);
1.1 provos 780:
781: buffer_clear(m);
782: buffer_put_int(m, authenticated);
783:
1.14 markus 784: debug3("%s: sending result %d", __func__, authenticated);
1.59 avsm 785: mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
1.1 provos 786:
787: call_count++;
788: if (plen == 0 && call_count == 1)
789: auth_method = "none";
790: else
791: auth_method = "password";
792:
793: /* Causes monitor loop to terminate if authenticated */
794: return (authenticated);
795: }
796:
797: int
1.59 avsm 798: mm_answer_bsdauthquery(int sock, Buffer *m)
1.1 provos 799: {
800: char *name, *infotxt;
801: u_int numprompts;
802: u_int *echo_on;
803: char **prompts;
1.31 markus 804: u_int success;
1.1 provos 805:
1.31 markus 806: success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
807: &prompts, &echo_on) < 0 ? 0 : 1;
1.1 provos 808:
809: buffer_clear(m);
1.31 markus 810: buffer_put_int(m, success);
811: if (success)
1.1 provos 812: buffer_put_cstring(m, prompts[0]);
813:
1.31 markus 814: debug3("%s: sending challenge success: %u", __func__, success);
1.59 avsm 815: mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
1.1 provos 816:
1.31 markus 817: if (success) {
1.124 djm 818: free(name);
819: free(infotxt);
820: free(prompts);
821: free(echo_on);
1.1 provos 822: }
823:
824: return (0);
825: }
826:
827: int
1.59 avsm 828: mm_answer_bsdauthrespond(int sock, Buffer *m)
1.1 provos 829: {
830: char *response;
831: int authok;
832:
833: if (authctxt->as == 0)
1.14 markus 834: fatal("%s: no bsd auth session", __func__);
1.1 provos 835:
836: response = buffer_get_string(m, NULL);
1.12 markus 837: authok = options.challenge_response_authentication &&
838: auth_userresponse(authctxt->as, response, 0);
1.1 provos 839: authctxt->as = NULL;
1.14 markus 840: debug3("%s: <%s> = <%d>", __func__, response, authok);
1.124 djm 841: free(response);
1.1 provos 842:
843: buffer_clear(m);
844: buffer_put_int(m, authok);
845:
1.14 markus 846: debug3("%s: sending authenticated: %d", __func__, authok);
1.59 avsm 847: mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
1.1 provos 848:
1.122 markus 849: if (compat20) {
850: auth_method = "keyboard-interactive";
851: auth_submethod = "bsdauth";
852: } else
1.118 djm 853: auth_method = "bsdauth";
1.1 provos 854:
855: return (authok != 0);
856: }
857:
858: int
1.59 avsm 859: mm_answer_keyallowed(int sock, Buffer *m)
1.1 provos 860: {
861: Key *key;
1.26 markus 862: char *cuser, *chost;
863: u_char *blob;
1.1 provos 864: u_int bloblen;
865: enum mm_keytype type = 0;
866: int allowed = 0;
867:
1.14 markus 868: debug3("%s entering", __func__);
1.3 markus 869:
1.1 provos 870: type = buffer_get_int(m);
871: cuser = buffer_get_string(m, NULL);
872: chost = buffer_get_string(m, NULL);
873: blob = buffer_get_string(m, &bloblen);
874:
875: key = key_from_blob(blob, bloblen);
876:
877: if ((compat20 && type == MM_RSAHOSTKEY) ||
878: (!compat20 && type != MM_RSAHOSTKEY))
1.14 markus 879: fatal("%s: key type and protocol mismatch", __func__);
1.1 provos 880:
1.14 markus 881: debug3("%s: key_from_blob: %p", __func__, key);
1.1 provos 882:
1.51 djm 883: if (key != NULL && authctxt->valid) {
1.63 deraadt 884: switch (type) {
1.1 provos 885: case MM_USERKEY:
1.12 markus 886: allowed = options.pubkey_authentication &&
887: user_key_allowed(authctxt->pw, key);
1.126 djm 888: pubkey_auth_info(authctxt, key, NULL);
1.77 dtucker 889: auth_method = "publickey";
1.97 dtucker 890: if (options.pubkey_authentication && allowed != 1)
891: auth_clear_options();
1.1 provos 892: break;
893: case MM_HOSTKEY:
1.12 markus 894: allowed = options.hostbased_authentication &&
895: hostbased_key_allowed(authctxt->pw,
1.1 provos 896: cuser, chost, key);
1.126 djm 897: pubkey_auth_info(authctxt, key,
898: "client user \"%.100s\", client host \"%.100s\"",
899: cuser, chost);
1.77 dtucker 900: auth_method = "hostbased";
1.1 provos 901: break;
1.132 markus 902: #ifdef WITH_SSH1
1.1 provos 903: case MM_RSAHOSTKEY:
904: key->type = KEY_RSA1; /* XXX */
1.12 markus 905: allowed = options.rhosts_rsa_authentication &&
906: auth_rhosts_rsa_key_allowed(authctxt->pw,
1.1 provos 907: cuser, chost, key);
1.97 dtucker 908: if (options.rhosts_rsa_authentication && allowed != 1)
909: auth_clear_options();
1.77 dtucker 910: auth_method = "rsa";
1.1 provos 911: break;
1.132 markus 912: #endif
1.1 provos 913: default:
1.14 markus 914: fatal("%s: unknown key type %d", __func__, type);
1.1 provos 915: break;
916: }
1.33 markus 917: }
918: if (key != NULL)
1.1 provos 919: key_free(key);
920:
921: /* clear temporarily storage (used by verify) */
922: monitor_reset_key_state();
923:
924: if (allowed) {
925: /* Save temporarily for comparison in verify */
926: key_blob = blob;
927: key_bloblen = bloblen;
928: key_blobtype = type;
929: hostbased_cuser = cuser;
930: hostbased_chost = chost;
1.72 djm 931: } else {
1.77 dtucker 932: /* Log failed attempt */
1.125 djm 933: auth_log(authctxt, 0, 0, auth_method, NULL);
1.124 djm 934: free(blob);
935: free(cuser);
936: free(chost);
1.1 provos 937: }
938:
939: debug3("%s: key %p is %s",
1.98 dtucker 940: __func__, key, allowed ? "allowed" : "not allowed");
1.1 provos 941:
942: buffer_clear(m);
943: buffer_put_int(m, allowed);
1.32 markus 944: buffer_put_int(m, forced_command != NULL);
1.1 provos 945:
1.59 avsm 946: mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
1.1 provos 947:
948: if (type == MM_RSAHOSTKEY)
949: monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
950:
951: return (0);
952: }
953:
954: static int
955: monitor_valid_userblob(u_char *data, u_int datalen)
956: {
957: Buffer b;
1.121 djm 958: char *p, *userstyle;
1.1 provos 959: u_int len;
960: int fail = 0;
961:
962: buffer_init(&b);
963: buffer_append(&b, data, datalen);
1.3 markus 964:
1.1 provos 965: if (datafellows & SSH_OLD_SESSIONID) {
1.13 markus 966: p = buffer_ptr(&b);
967: len = buffer_len(&b);
968: if ((session_id2 == NULL) ||
969: (len < session_id2_len) ||
1.108 djm 970: (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1.13 markus 971: fail++;
1.1 provos 972: buffer_consume(&b, session_id2_len);
973: } else {
1.13 markus 974: p = buffer_get_string(&b, &len);
975: if ((session_id2 == NULL) ||
976: (len != session_id2_len) ||
1.108 djm 977: (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1.1 provos 978: fail++;
1.124 djm 979: free(p);
1.1 provos 980: }
981: if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
982: fail++;
1.121 djm 983: p = buffer_get_cstring(&b, NULL);
984: xasprintf(&userstyle, "%s%s%s", authctxt->user,
985: authctxt->style ? ":" : "",
986: authctxt->style ? authctxt->style : "");
987: if (strcmp(userstyle, p) != 0) {
1.38 itojun 988: logit("wrong user name passed to monitor: expected %s != %.100s",
1.121 djm 989: userstyle, p);
1.1 provos 990: fail++;
991: }
1.124 djm 992: free(userstyle);
993: free(p);
1.1 provos 994: buffer_skip_string(&b);
995: if (datafellows & SSH_BUG_PKAUTH) {
996: if (!buffer_get_char(&b))
997: fail++;
998: } else {
1.121 djm 999: p = buffer_get_cstring(&b, NULL);
1.1 provos 1000: if (strcmp("publickey", p) != 0)
1001: fail++;
1.124 djm 1002: free(p);
1.1 provos 1003: if (!buffer_get_char(&b))
1004: fail++;
1005: buffer_skip_string(&b);
1006: }
1007: buffer_skip_string(&b);
1008: if (buffer_len(&b) != 0)
1009: fail++;
1010: buffer_free(&b);
1011: return (fail == 0);
1012: }
1013:
1014: static int
1.26 markus 1015: monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1016: char *chost)
1.1 provos 1017: {
1018: Buffer b;
1.121 djm 1019: char *p, *userstyle;
1.1 provos 1020: u_int len;
1021: int fail = 0;
1022:
1023: buffer_init(&b);
1024: buffer_append(&b, data, datalen);
1.3 markus 1025:
1.13 markus 1026: p = buffer_get_string(&b, &len);
1027: if ((session_id2 == NULL) ||
1028: (len != session_id2_len) ||
1.108 djm 1029: (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1.1 provos 1030: fail++;
1.124 djm 1031: free(p);
1.13 markus 1032:
1.1 provos 1033: if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1034: fail++;
1.121 djm 1035: p = buffer_get_cstring(&b, NULL);
1036: xasprintf(&userstyle, "%s%s%s", authctxt->user,
1037: authctxt->style ? ":" : "",
1038: authctxt->style ? authctxt->style : "");
1039: if (strcmp(userstyle, p) != 0) {
1.38 itojun 1040: logit("wrong user name passed to monitor: expected %s != %.100s",
1.121 djm 1041: userstyle, p);
1.1 provos 1042: fail++;
1043: }
1.121 djm 1044: free(userstyle);
1.124 djm 1045: free(p);
1.1 provos 1046: buffer_skip_string(&b); /* service */
1.121 djm 1047: p = buffer_get_cstring(&b, NULL);
1.1 provos 1048: if (strcmp(p, "hostbased") != 0)
1049: fail++;
1.124 djm 1050: free(p);
1.1 provos 1051: buffer_skip_string(&b); /* pkalg */
1052: buffer_skip_string(&b); /* pkblob */
1053:
1054: /* verify client host, strip trailing dot if necessary */
1055: p = buffer_get_string(&b, NULL);
1056: if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1057: p[len - 1] = '\0';
1058: if (strcmp(p, chost) != 0)
1059: fail++;
1.124 djm 1060: free(p);
1.1 provos 1061:
1062: /* verify client user */
1063: p = buffer_get_string(&b, NULL);
1064: if (strcmp(p, cuser) != 0)
1065: fail++;
1.124 djm 1066: free(p);
1.1 provos 1067:
1068: if (buffer_len(&b) != 0)
1069: fail++;
1070: buffer_free(&b);
1071: return (fail == 0);
1072: }
1073:
1074: int
1.59 avsm 1075: mm_answer_keyverify(int sock, Buffer *m)
1.1 provos 1076: {
1077: Key *key;
1078: u_char *signature, *data, *blob;
1079: u_int signaturelen, datalen, bloblen;
1080: int verified = 0;
1081: int valid_data = 0;
1082:
1083: blob = buffer_get_string(m, &bloblen);
1084: signature = buffer_get_string(m, &signaturelen);
1085: data = buffer_get_string(m, &datalen);
1086:
1087: if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1.8 mouring 1088: !monitor_allowed_key(blob, bloblen))
1.14 markus 1089: fatal("%s: bad key, not previously allowed", __func__);
1.1 provos 1090:
1091: key = key_from_blob(blob, bloblen);
1092: if (key == NULL)
1.14 markus 1093: fatal("%s: bad public key blob", __func__);
1.1 provos 1094:
1095: switch (key_blobtype) {
1096: case MM_USERKEY:
1097: valid_data = monitor_valid_userblob(data, datalen);
1098: break;
1099: case MM_HOSTKEY:
1100: valid_data = monitor_valid_hostbasedblob(data, datalen,
1101: hostbased_cuser, hostbased_chost);
1102: break;
1103: default:
1104: valid_data = 0;
1105: break;
1106: }
1107: if (!valid_data)
1.14 markus 1108: fatal("%s: bad signature data blob", __func__);
1.1 provos 1109:
1110: verified = key_verify(key, signature, signaturelen, data, datalen);
1111: debug3("%s: key %p signature %s",
1.89 markus 1112: __func__, key, (verified == 1) ? "verified" : "unverified");
1.1 provos 1113:
1114: key_free(key);
1.124 djm 1115: free(blob);
1116: free(signature);
1117: free(data);
1.1 provos 1118:
1.17 stevesk 1119: auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1120:
1.1 provos 1121: monitor_reset_key_state();
1.3 markus 1122:
1.1 provos 1123: buffer_clear(m);
1124: buffer_put_int(m, verified);
1.59 avsm 1125: mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
1.1 provos 1126:
1.89 markus 1127: return (verified == 1);
1.1 provos 1128: }
1129:
1.2 markus 1130: static void
1.1 provos 1131: mm_record_login(Session *s, struct passwd *pw)
1132: {
1133: socklen_t fromlen;
1134: struct sockaddr_storage from;
1135:
1136: /*
1137: * Get IP address of client. If the connection is not a socket, let
1138: * the address be 0.0.0.0.
1139: */
1140: memset(&from, 0, sizeof(from));
1.24 stevesk 1141: fromlen = sizeof(from);
1.1 provos 1142: if (packet_connection_is_on_socket()) {
1143: if (getpeername(packet_get_connection_in(),
1.74 deraadt 1144: (struct sockaddr *)&from, &fromlen) < 0) {
1.1 provos 1145: debug("getpeername: %.100s", strerror(errno));
1.50 markus 1146: cleanup_exit(255);
1.1 provos 1147: }
1148: }
1149: /* Record that there was a login on that tty from the remote host. */
1150: record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1.42 markus 1151: get_remote_name_or_ip(utmp_len, options.use_dns),
1.24 stevesk 1152: (struct sockaddr *)&from, fromlen);
1.1 provos 1153: }
1154:
1155: static void
1156: mm_session_close(Session *s)
1157: {
1.41 djm 1158: debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
1.1 provos 1159: if (s->ttyfd != -1) {
1.86 stevesk 1160: debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1.1 provos 1161: session_pty_cleanup2(s);
1162: }
1.96 djm 1163: session_unused(s->self);
1.1 provos 1164: }
1165:
1166: int
1.59 avsm 1167: mm_answer_pty(int sock, Buffer *m)
1.1 provos 1168: {
1.11 mouring 1169: extern struct monitor *pmonitor;
1.1 provos 1170: Session *s;
1171: int res, fd0;
1172:
1.14 markus 1173: debug3("%s entering", __func__);
1.1 provos 1174:
1175: buffer_clear(m);
1176: s = session_new();
1177: if (s == NULL)
1178: goto error;
1179: s->authctxt = authctxt;
1180: s->pw = authctxt->pw;
1.11 mouring 1181: s->pid = pmonitor->m_pid;
1.1 provos 1182: res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1183: if (res == 0)
1184: goto error;
1185: pty_setowner(authctxt->pw, s->tty);
1186:
1187: buffer_put_int(m, 1);
1188: buffer_put_cstring(m, s->tty);
1189:
1190: /* We need to trick ttyslot */
1191: if (dup2(s->ttyfd, 0) == -1)
1.14 markus 1192: fatal("%s: dup2", __func__);
1.1 provos 1193:
1194: mm_record_login(s, authctxt->pw);
1195:
1196: /* Now we can close the file descriptor again */
1197: close(0);
1.61 dtucker 1198:
1199: /* send messages generated by record_login */
1200: buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
1201: buffer_clear(&loginmsg);
1202:
1203: mm_request_send(sock, MONITOR_ANS_PTY, m);
1204:
1.92 djm 1205: if (mm_send_fd(sock, s->ptyfd) == -1 ||
1206: mm_send_fd(sock, s->ttyfd) == -1)
1207: fatal("%s: send fds failed", __func__);
1.1 provos 1208:
1209: /* make sure nothing uses fd 0 */
1210: if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1.14 markus 1211: fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
1.1 provos 1212: if (fd0 != 0)
1.14 markus 1213: error("%s: fd0 %d != 0", __func__, fd0);
1.1 provos 1214:
1215: /* slave is not needed */
1216: close(s->ttyfd);
1217: s->ttyfd = s->ptyfd;
1218: /* no need to dup() because nobody closes ptyfd */
1219: s->ptymaster = s->ptyfd;
1220:
1.86 stevesk 1221: debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
1.1 provos 1222:
1223: return (0);
1224:
1225: error:
1226: if (s != NULL)
1227: mm_session_close(s);
1228: buffer_put_int(m, 0);
1.59 avsm 1229: mm_request_send(sock, MONITOR_ANS_PTY, m);
1.1 provos 1230: return (0);
1231: }
1232:
1233: int
1.59 avsm 1234: mm_answer_pty_cleanup(int sock, Buffer *m)
1.1 provos 1235: {
1236: Session *s;
1237: char *tty;
1238:
1.14 markus 1239: debug3("%s entering", __func__);
1.1 provos 1240:
1241: tty = buffer_get_string(m, NULL);
1242: if ((s = session_by_tty(tty)) != NULL)
1243: mm_session_close(s);
1244: buffer_clear(m);
1.124 djm 1245: free(tty);
1.1 provos 1246: return (0);
1247: }
1248:
1.132 markus 1249: #ifdef WITH_SSH1
1.1 provos 1250: int
1.59 avsm 1251: mm_answer_sesskey(int sock, Buffer *m)
1.1 provos 1252: {
1253: BIGNUM *p;
1254: int rsafail;
1255:
1256: /* Turn off permissions */
1.62 dtucker 1257: monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0);
1.1 provos 1258:
1259: if ((p = BN_new()) == NULL)
1.14 markus 1260: fatal("%s: BN_new", __func__);
1.1 provos 1261:
1262: buffer_get_bignum2(m, p);
1263:
1264: rsafail = ssh1_session_key(p);
1265:
1266: buffer_clear(m);
1267: buffer_put_int(m, rsafail);
1268: buffer_put_bignum2(m, p);
1269:
1270: BN_clear_free(p);
1271:
1.59 avsm 1272: mm_request_send(sock, MONITOR_ANS_SESSKEY, m);
1.1 provos 1273:
1274: /* Turn on permissions for sessid passing */
1275: monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1276:
1277: return (0);
1278: }
1279:
1280: int
1.59 avsm 1281: mm_answer_sessid(int sock, Buffer *m)
1.1 provos 1282: {
1283: int i;
1284:
1.14 markus 1285: debug3("%s entering", __func__);
1.1 provos 1286:
1287: if (buffer_len(m) != 16)
1.14 markus 1288: fatal("%s: bad ssh1 session id", __func__);
1.1 provos 1289: for (i = 0; i < 16; i++)
1290: session_id[i] = buffer_get_char(m);
1291:
1292: /* Turn on permissions for getpwnam */
1293: monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1294:
1295: return (0);
1296: }
1297:
1298: int
1.59 avsm 1299: mm_answer_rsa_keyallowed(int sock, Buffer *m)
1.1 provos 1300: {
1301: BIGNUM *client_n;
1302: Key *key = NULL;
1.3 markus 1303: u_char *blob = NULL;
1304: u_int blen = 0;
1.1 provos 1305: int allowed = 0;
1306:
1.14 markus 1307: debug3("%s entering", __func__);
1.1 provos 1308:
1.77 dtucker 1309: auth_method = "rsa";
1.12 markus 1310: if (options.rsa_authentication && authctxt->valid) {
1.1 provos 1311: if ((client_n = BN_new()) == NULL)
1.14 markus 1312: fatal("%s: BN_new", __func__);
1.1 provos 1313: buffer_get_bignum2(m, client_n);
1314: allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1315: BN_clear_free(client_n);
1316: }
1317: buffer_clear(m);
1318: buffer_put_int(m, allowed);
1.32 markus 1319: buffer_put_int(m, forced_command != NULL);
1.1 provos 1320:
1321: /* clear temporarily storage (used by generate challenge) */
1322: monitor_reset_key_state();
1323:
1324: if (allowed && key != NULL) {
1325: key->type = KEY_RSA; /* cheat for key_to_blob */
1326: if (key_to_blob(key, &blob, &blen) == 0)
1.14 markus 1327: fatal("%s: key_to_blob failed", __func__);
1.1 provos 1328: buffer_put_string(m, blob, blen);
1329:
1330: /* Save temporarily for comparison in verify */
1331: key_blob = blob;
1332: key_bloblen = blen;
1333: key_blobtype = MM_RSAUSERKEY;
1.33 markus 1334: }
1335: if (key != NULL)
1.1 provos 1336: key_free(key);
1337:
1.59 avsm 1338: mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m);
1.1 provos 1339:
1340: monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1341: monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1342: return (0);
1343: }
1344:
1345: int
1.59 avsm 1346: mm_answer_rsa_challenge(int sock, Buffer *m)
1.1 provos 1347: {
1348: Key *key = NULL;
1.3 markus 1349: u_char *blob;
1350: u_int blen;
1.1 provos 1351:
1.14 markus 1352: debug3("%s entering", __func__);
1.1 provos 1353:
1354: if (!authctxt->valid)
1.14 markus 1355: fatal("%s: authctxt not valid", __func__);
1.1 provos 1356: blob = buffer_get_string(m, &blen);
1357: if (!monitor_allowed_key(blob, blen))
1.14 markus 1358: fatal("%s: bad key, not previously allowed", __func__);
1.1 provos 1359: if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1.14 markus 1360: fatal("%s: key type mismatch", __func__);
1.1 provos 1361: if ((key = key_from_blob(blob, blen)) == NULL)
1.14 markus 1362: fatal("%s: received bad key", __func__);
1.101 djm 1363: if (key->type != KEY_RSA)
1364: fatal("%s: received bad key type %d", __func__, key->type);
1365: key->type = KEY_RSA1;
1.1 provos 1366: if (ssh1_challenge)
1367: BN_clear_free(ssh1_challenge);
1368: ssh1_challenge = auth_rsa_generate_challenge(key);
1369:
1370: buffer_clear(m);
1371: buffer_put_bignum2(m, ssh1_challenge);
1372:
1.14 markus 1373: debug3("%s sending reply", __func__);
1.59 avsm 1374: mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m);
1.1 provos 1375:
1376: monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1.33 markus 1377:
1.124 djm 1378: free(blob);
1.33 markus 1379: key_free(key);
1.1 provos 1380: return (0);
1381: }
1382:
1383: int
1.59 avsm 1384: mm_answer_rsa_response(int sock, Buffer *m)
1.1 provos 1385: {
1386: Key *key = NULL;
1.3 markus 1387: u_char *blob, *response;
1388: u_int blen, len;
1389: int success;
1.1 provos 1390:
1.14 markus 1391: debug3("%s entering", __func__);
1.1 provos 1392:
1393: if (!authctxt->valid)
1.14 markus 1394: fatal("%s: authctxt not valid", __func__);
1.1 provos 1395: if (ssh1_challenge == NULL)
1.14 markus 1396: fatal("%s: no ssh1_challenge", __func__);
1.1 provos 1397:
1398: blob = buffer_get_string(m, &blen);
1399: if (!monitor_allowed_key(blob, blen))
1.14 markus 1400: fatal("%s: bad key, not previously allowed", __func__);
1.1 provos 1401: if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1.14 markus 1402: fatal("%s: key type mismatch: %d", __func__, key_blobtype);
1.1 provos 1403: if ((key = key_from_blob(blob, blen)) == NULL)
1.14 markus 1404: fatal("%s: received bad key", __func__);
1.1 provos 1405: response = buffer_get_string(m, &len);
1406: if (len != 16)
1.14 markus 1407: fatal("%s: received bad response to challenge", __func__);
1.1 provos 1408: success = auth_rsa_verify_response(key, ssh1_challenge, response);
1409:
1.124 djm 1410: free(blob);
1.1 provos 1411: key_free(key);
1.124 djm 1412: free(response);
1.1 provos 1413:
1414: auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1415:
1416: /* reset state */
1417: BN_clear_free(ssh1_challenge);
1418: ssh1_challenge = NULL;
1419: monitor_reset_key_state();
1420:
1421: buffer_clear(m);
1422: buffer_put_int(m, success);
1.59 avsm 1423: mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m);
1.1 provos 1424:
1425: return (success);
1426: }
1.132 markus 1427: #endif
1.1 provos 1428:
1429: int
1.59 avsm 1430: mm_answer_term(int sock, Buffer *req)
1.1 provos 1431: {
1.11 mouring 1432: extern struct monitor *pmonitor;
1.1 provos 1433: int res, status;
1434:
1.14 markus 1435: debug3("%s: tearing down sessions", __func__);
1.1 provos 1436:
1437: /* The child is terminating */
1438: session_destroy_all(&mm_session_close);
1439:
1.11 mouring 1440: while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1.9 markus 1441: if (errno != EINTR)
1442: exit(1);
1.1 provos 1443:
1444: res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1445:
1446: /* Terminate process */
1.57 deraadt 1447: exit(res);
1.1 provos 1448: }
1449:
1450: void
1.11 mouring 1451: monitor_apply_keystate(struct monitor *pmonitor)
1.1 provos 1452: {
1453: if (compat20) {
1454: set_newkeys(MODE_IN);
1455: set_newkeys(MODE_OUT);
1456: } else {
1457: packet_set_protocol_flags(child_state.ssh1protoflags);
1.15 markus 1458: packet_set_encryption_key(child_state.ssh1key,
1459: child_state.ssh1keylen, child_state.ssh1cipher);
1.124 djm 1460: free(child_state.ssh1key);
1.1 provos 1461: }
1462:
1.15 markus 1463: /* for rc4 and other stateful ciphers */
1.1 provos 1464: packet_set_keycontext(MODE_OUT, child_state.keyout);
1.124 djm 1465: free(child_state.keyout);
1.1 provos 1466: packet_set_keycontext(MODE_IN, child_state.keyin);
1.124 djm 1467: free(child_state.keyin);
1.1 provos 1468:
1469: if (!compat20) {
1470: packet_set_iv(MODE_OUT, child_state.ivout);
1.124 djm 1471: free(child_state.ivout);
1.1 provos 1472: packet_set_iv(MODE_IN, child_state.ivin);
1.124 djm 1473: free(child_state.ivin);
1.1 provos 1474: }
1475:
1476: memcpy(&incoming_stream, &child_state.incoming,
1477: sizeof(incoming_stream));
1478: memcpy(&outgoing_stream, &child_state.outgoing,
1479: sizeof(outgoing_stream));
1.3 markus 1480:
1.1 provos 1481: /* Update with new address */
1.16 djm 1482: if (options.compression)
1483: mm_init_compression(pmonitor->m_zlib);
1.133 markus 1484:
1485: packet_set_postauth();
1.123 dtucker 1486:
1487: if (options.rekey_limit || options.rekey_interval)
1488: packet_set_rekey_limits((u_int32_t)options.rekey_limit,
1489: (time_t)options.rekey_interval);
1.1 provos 1490:
1491: /* Network I/O buffers */
1492: /* XXX inefficient for large buffers, need: buffer_init_from_string */
1.102 andreas 1493: buffer_clear(packet_get_input());
1494: buffer_append(packet_get_input(), child_state.input, child_state.ilen);
1.131 djm 1495: explicit_bzero(child_state.input, child_state.ilen);
1.124 djm 1496: free(child_state.input);
1.1 provos 1497:
1.102 andreas 1498: buffer_clear(packet_get_output());
1499: buffer_append(packet_get_output(), child_state.output,
1500: child_state.olen);
1.131 djm 1501: explicit_bzero(child_state.output, child_state.olen);
1.124 djm 1502: free(child_state.output);
1.103 andreas 1503:
1504: /* Roaming */
1505: if (compat20)
1506: roam_set_bytes(child_state.sent_bytes, child_state.recv_bytes);
1.1 provos 1507: }
1508:
1.2 markus 1509: static Kex *
1.1 provos 1510: mm_get_kex(Buffer *m)
1511: {
1512: Kex *kex;
1513: void *blob;
1514: u_int bloblen;
1515:
1.75 djm 1516: kex = xcalloc(1, sizeof(*kex));
1.1 provos 1517: kex->session_id = buffer_get_string(m, &kex->session_id_len);
1.107 djm 1518: if (session_id2 == NULL ||
1519: kex->session_id_len != session_id2_len ||
1.108 djm 1520: timingsafe_bcmp(kex->session_id, session_id2, session_id2_len) != 0)
1.13 markus 1521: fatal("mm_get_get: internal error: bad session id");
1.1 provos 1522: kex->we_need = buffer_get_int(m);
1.132 markus 1523: #ifdef WITH_OPENSSL
1.34 markus 1524: kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1.58 djm 1525: kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
1.34 markus 1526: kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
1.69 djm 1527: kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
1.109 djm 1528: kex->kex[KEX_ECDH_SHA2] = kexecdh_server;
1.132 markus 1529: #endif
1.128 markus 1530: kex->kex[KEX_C25519_SHA256] = kexc25519_server;
1.1 provos 1531: kex->server = 1;
1532: kex->hostkey_type = buffer_get_int(m);
1533: kex->kex_type = buffer_get_int(m);
1534: blob = buffer_get_string(m, &bloblen);
1535: buffer_init(&kex->my);
1536: buffer_append(&kex->my, blob, bloblen);
1.124 djm 1537: free(blob);
1.1 provos 1538: blob = buffer_get_string(m, &bloblen);
1539: buffer_init(&kex->peer);
1540: buffer_append(&kex->peer, blob, bloblen);
1.124 djm 1541: free(blob);
1.1 provos 1542: kex->done = 1;
1543: kex->flags = buffer_get_int(m);
1544: kex->client_version_string = buffer_get_string(m, NULL);
1545: kex->server_version_string = buffer_get_string(m, NULL);
1.105 djm 1546: kex->load_host_public_key=&get_hostkey_public_by_type;
1547: kex->load_host_private_key=&get_hostkey_private_by_type;
1.1 provos 1548: kex->host_key_index=&get_hostkey_index;
1.127 markus 1549: kex->sign = sshd_hostkey_sign;
1.1 provos 1550:
1551: return (kex);
1552: }
1553:
1554: /* This function requries careful sanity checking */
1555:
1556: void
1.11 mouring 1557: mm_get_keystate(struct monitor *pmonitor)
1.1 provos 1558: {
1559: Buffer m;
1560: u_char *blob, *p;
1561: u_int bloblen, plen;
1.37 markus 1562: u_int32_t seqnr, packets;
1.99 markus 1563: u_int64_t blocks, bytes;
1.1 provos 1564:
1.14 markus 1565: debug3("%s: Waiting for new keys", __func__);
1.1 provos 1566:
1567: buffer_init(&m);
1.11 mouring 1568: mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1.1 provos 1569: if (!compat20) {
1570: child_state.ssh1protoflags = buffer_get_int(&m);
1571: child_state.ssh1cipher = buffer_get_int(&m);
1.15 markus 1572: child_state.ssh1key = buffer_get_string(&m,
1573: &child_state.ssh1keylen);
1.1 provos 1574: child_state.ivout = buffer_get_string(&m,
1575: &child_state.ivoutlen);
1576: child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1577: goto skip;
1578: } else {
1579: /* Get the Kex for rekeying */
1.11 mouring 1580: *pmonitor->m_pkex = mm_get_kex(&m);
1.1 provos 1581: }
1582:
1583: blob = buffer_get_string(&m, &bloblen);
1584: current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1.124 djm 1585: free(blob);
1.1 provos 1586:
1.14 markus 1587: debug3("%s: Waiting for second key", __func__);
1.1 provos 1588: blob = buffer_get_string(&m, &bloblen);
1589: current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1.124 djm 1590: free(blob);
1.3 markus 1591:
1.1 provos 1592: /* Now get sequence numbers for the packets */
1.37 markus 1593: seqnr = buffer_get_int(&m);
1594: blocks = buffer_get_int64(&m);
1595: packets = buffer_get_int(&m);
1.99 markus 1596: bytes = buffer_get_int64(&m);
1597: packet_set_state(MODE_OUT, seqnr, blocks, packets, bytes);
1.37 markus 1598: seqnr = buffer_get_int(&m);
1599: blocks = buffer_get_int64(&m);
1600: packets = buffer_get_int(&m);
1.99 markus 1601: bytes = buffer_get_int64(&m);
1602: packet_set_state(MODE_IN, seqnr, blocks, packets, bytes);
1.1 provos 1603:
1604: skip:
1605: /* Get the key context */
1606: child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1607: child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1608:
1.14 markus 1609: debug3("%s: Getting compression state", __func__);
1.1 provos 1610: /* Get compression state */
1611: p = buffer_get_string(&m, &plen);
1612: if (plen != sizeof(child_state.outgoing))
1.14 markus 1613: fatal("%s: bad request size", __func__);
1.1 provos 1614: memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1.124 djm 1615: free(p);
1.1 provos 1616:
1617: p = buffer_get_string(&m, &plen);
1618: if (plen != sizeof(child_state.incoming))
1.14 markus 1619: fatal("%s: bad request size", __func__);
1.1 provos 1620: memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1.124 djm 1621: free(p);
1.1 provos 1622:
1623: /* Network I/O buffers */
1.14 markus 1624: debug3("%s: Getting Network I/O buffers", __func__);
1.1 provos 1625: child_state.input = buffer_get_string(&m, &child_state.ilen);
1626: child_state.output = buffer_get_string(&m, &child_state.olen);
1.103 andreas 1627:
1628: /* Roaming */
1629: if (compat20) {
1630: child_state.sent_bytes = buffer_get_int64(&m);
1631: child_state.recv_bytes = buffer_get_int64(&m);
1632: }
1.1 provos 1633:
1634: buffer_free(&m);
1635: }
1636:
1637:
1638: /* Allocation functions for zlib */
1639: void *
1640: mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1641: {
1.30 markus 1642: size_t len = (size_t) size * ncount;
1.1 provos 1643: void *address;
1644:
1.23 millert 1645: if (len == 0 || ncount > SIZE_T_MAX / size)
1.18 deraadt 1646: fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1647:
1648: address = mm_malloc(mm, len);
1.1 provos 1649:
1650: return (address);
1651: }
1652:
1653: void
1654: mm_zfree(struct mm_master *mm, void *address)
1655: {
1656: mm_free(mm, address);
1657: }
1658:
1659: void
1660: mm_init_compression(struct mm_master *mm)
1661: {
1662: outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1663: outgoing_stream.zfree = (free_func)mm_zfree;
1664: outgoing_stream.opaque = mm;
1665:
1666: incoming_stream.zalloc = (alloc_func)mm_zalloc;
1667: incoming_stream.zfree = (free_func)mm_zfree;
1668: incoming_stream.opaque = mm;
1669: }
1670:
1671: /* XXX */
1672:
1673: #define FD_CLOSEONEXEC(x) do { \
1.111 djm 1674: if (fcntl(x, F_SETFD, FD_CLOEXEC) == -1) \
1.1 provos 1675: fatal("fcntl(%d, F_SETFD)", x); \
1676: } while (0)
1677:
1.2 markus 1678: static void
1.114 djm 1679: monitor_openfds(struct monitor *mon, int do_logfds)
1.3 markus 1680: {
1.114 djm 1681: int pair[2];
1682:
1.1 provos 1683: if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1.114 djm 1684: fatal("%s: socketpair: %s", __func__, strerror(errno));
1.1 provos 1685: FD_CLOSEONEXEC(pair[0]);
1686: FD_CLOSEONEXEC(pair[1]);
1.114 djm 1687: mon->m_recvfd = pair[0];
1688: mon->m_sendfd = pair[1];
1689:
1690: if (do_logfds) {
1691: if (pipe(pair) == -1)
1692: fatal("%s: pipe: %s", __func__, strerror(errno));
1693: FD_CLOSEONEXEC(pair[0]);
1694: FD_CLOSEONEXEC(pair[1]);
1695: mon->m_log_recvfd = pair[0];
1696: mon->m_log_sendfd = pair[1];
1697: } else
1698: mon->m_log_recvfd = mon->m_log_sendfd = -1;
1.1 provos 1699: }
1700:
1701: #define MM_MEMSIZE 65536
1702:
1703: struct monitor *
1704: monitor_init(void)
1705: {
1706: struct monitor *mon;
1707:
1.75 djm 1708: mon = xcalloc(1, sizeof(*mon));
1.1 provos 1709:
1.114 djm 1710: monitor_openfds(mon, 1);
1.1 provos 1711:
1712: /* Used to share zlib space across processes */
1.16 djm 1713: if (options.compression) {
1714: mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1715: mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
1.1 provos 1716:
1.16 djm 1717: /* Compression needs to share state across borders */
1718: mm_init_compression(mon->m_zlib);
1719: }
1.1 provos 1720:
1721: return mon;
1722: }
1723:
1724: void
1725: monitor_reinit(struct monitor *mon)
1726: {
1.114 djm 1727: monitor_openfds(mon, 0);
1.1 provos 1728: }
1.46 markus 1729:
1730: #ifdef GSSAPI
1731: int
1.59 avsm 1732: mm_answer_gss_setup_ctx(int sock, Buffer *m)
1.46 markus 1733: {
1.59 avsm 1734: gss_OID_desc goid;
1.46 markus 1735: OM_uint32 major;
1736: u_int len;
1737:
1.59 avsm 1738: goid.elements = buffer_get_string(m, &len);
1739: goid.length = len;
1.46 markus 1740:
1.59 avsm 1741: major = ssh_gssapi_server_ctx(&gsscontext, &goid);
1.46 markus 1742:
1.124 djm 1743: free(goid.elements);
1.46 markus 1744:
1745: buffer_clear(m);
1746: buffer_put_int(m, major);
1747:
1.64 stevesk 1748: mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
1.46 markus 1749:
1750: /* Now we have a context, enable the step */
1751: monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1752:
1753: return (0);
1754: }
1755:
1756: int
1.59 avsm 1757: mm_answer_gss_accept_ctx(int sock, Buffer *m)
1.46 markus 1758: {
1759: gss_buffer_desc in;
1760: gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
1.64 stevesk 1761: OM_uint32 major, minor;
1.46 markus 1762: OM_uint32 flags = 0; /* GSI needs this */
1.47 deraadt 1763: u_int len;
1.46 markus 1764:
1.47 deraadt 1765: in.value = buffer_get_string(m, &len);
1766: in.length = len;
1.46 markus 1767: major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1.124 djm 1768: free(in.value);
1.46 markus 1769:
1770: buffer_clear(m);
1771: buffer_put_int(m, major);
1772: buffer_put_string(m, out.value, out.length);
1773: buffer_put_int(m, flags);
1.59 avsm 1774: mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
1.46 markus 1775:
1776: gss_release_buffer(&minor, &out);
1777:
1.64 stevesk 1778: if (major == GSS_S_COMPLETE) {
1.46 markus 1779: monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
1780: monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1.52 markus 1781: monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
1.46 markus 1782: }
1783: return (0);
1784: }
1785:
1786: int
1.59 avsm 1787: mm_answer_gss_checkmic(int sock, Buffer *m)
1.52 markus 1788: {
1789: gss_buffer_desc gssbuf, mic;
1790: OM_uint32 ret;
1791: u_int len;
1.54 djm 1792:
1.52 markus 1793: gssbuf.value = buffer_get_string(m, &len);
1794: gssbuf.length = len;
1795: mic.value = buffer_get_string(m, &len);
1796: mic.length = len;
1.54 djm 1797:
1.52 markus 1798: ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
1.54 djm 1799:
1.124 djm 1800: free(gssbuf.value);
1801: free(mic.value);
1.54 djm 1802:
1.52 markus 1803: buffer_clear(m);
1804: buffer_put_int(m, ret);
1.54 djm 1805:
1.59 avsm 1806: mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
1.54 djm 1807:
1.52 markus 1808: if (!GSS_ERROR(ret))
1809: monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1.54 djm 1810:
1.52 markus 1811: return (0);
1812: }
1813:
1814: int
1.59 avsm 1815: mm_answer_gss_userok(int sock, Buffer *m)
1.46 markus 1816: {
1817: int authenticated;
1818:
1819: authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1820:
1821: buffer_clear(m);
1822: buffer_put_int(m, authenticated);
1823:
1824: debug3("%s: sending result %d", __func__, authenticated);
1.59 avsm 1825: mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
1.46 markus 1826:
1.64 stevesk 1827: auth_method = "gssapi-with-mic";
1.46 markus 1828:
1829: /* Monitor loop will terminate if authenticated */
1830: return (authenticated);
1831: }
1832: #endif /* GSSAPI */
1.100 djm 1833:
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