Annotation of src/usr.bin/ssh/monitor.c, Revision 1.190
1.190 ! djm 1: /* $OpenBSD: monitor.c,v 1.189 2019/01/19 21:31:32 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>
1.95 djm 32: #include <sys/queue.h>
1.1 provos 33:
1.132 markus 34: #ifdef WITH_OPENSSL
1.78 stevesk 35: #include <openssl/dh.h>
1.132 markus 36: #endif
1.78 stevesk 37:
1.81 stevesk 38: #include <errno.h>
1.80 stevesk 39: #include <fcntl.h>
1.159 djm 40: #include <limits.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>
1.142 millert 46: #include <stdint.h>
1.134 djm 47: #include <stdio.h>
1.84 stevesk 48: #include <stdlib.h>
1.82 stevesk 49: #include <string.h>
1.186 djm 50: #include <unistd.h>
1.1 provos 51:
1.114 djm 52: #include "atomicio.h"
1.85 deraadt 53: #include "xmalloc.h"
1.1 provos 54: #include "ssh.h"
1.185 markus 55: #include "sshkey.h"
1.183 markus 56: #include "sshbuf.h"
1.85 deraadt 57: #include "hostfile.h"
1.1 provos 58: #include "auth.h"
1.85 deraadt 59: #include "cipher.h"
1.1 provos 60: #include "kex.h"
61: #include "dh.h"
62: #include "packet.h"
63: #include "auth-options.h"
64: #include "sshpty.h"
65: #include "channels.h"
66: #include "session.h"
67: #include "sshlogin.h"
68: #include "canohost.h"
69: #include "log.h"
1.135 millert 70: #include "misc.h"
1.1 provos 71: #include "servconf.h"
72: #include "monitor.h"
1.85 deraadt 73: #ifdef GSSAPI
74: #include "ssh-gss.h"
75: #endif
1.1 provos 76: #include "monitor_wrap.h"
77: #include "monitor_fdpass.h"
78: #include "compat.h"
79: #include "ssh2.h"
1.127 markus 80: #include "authfd.h"
1.137 djm 81: #include "match.h"
1.138 djm 82: #include "ssherr.h"
1.189 djm 83:
84: #include "opacket.h" /* XXX */
85: extern struct ssh *active_state; /* XXX */
1.1 provos 86:
1.46 markus 87: #ifdef GSSAPI
88: static Gssctxt *gsscontext = NULL;
89: #endif
90:
1.1 provos 91: /* Imports */
92: extern ServerOptions options;
93: extern u_int utmp_len;
94: extern u_char session_id[];
1.181 markus 95: extern struct sshbuf *loginmsg;
1.180 djm 96: extern struct sshauthopt *auth_opts; /* XXX move to permanent ssh->authctxt? */
1.1 provos 97:
98: /* State exported from the child */
1.139 markus 99: static struct sshbuf *child_state;
1.1 provos 100:
1.43 markus 101: /* Functions on the monitor that answer unprivileged requests */
1.1 provos 102:
1.183 markus 103: int mm_answer_moduli(int, struct sshbuf *);
104: int mm_answer_sign(int, struct sshbuf *);
105: int mm_answer_pwnamallow(int, struct sshbuf *);
106: int mm_answer_auth2_read_banner(int, struct sshbuf *);
107: int mm_answer_authserv(int, struct sshbuf *);
108: int mm_answer_authpassword(int, struct sshbuf *);
109: int mm_answer_bsdauthquery(int, struct sshbuf *);
110: int mm_answer_bsdauthrespond(int, struct sshbuf *);
111: int mm_answer_skeyquery(int, struct sshbuf *);
112: int mm_answer_skeyrespond(int, struct sshbuf *);
113: int mm_answer_keyallowed(int, struct sshbuf *);
114: int mm_answer_keyverify(int, struct sshbuf *);
115: int mm_answer_pty(int, struct sshbuf *);
116: int mm_answer_pty_cleanup(int, struct sshbuf *);
117: int mm_answer_term(int, struct sshbuf *);
118: int mm_answer_rsa_keyallowed(int, struct sshbuf *);
119: int mm_answer_rsa_challenge(int, struct sshbuf *);
120: int mm_answer_rsa_response(int, struct sshbuf *);
121: int mm_answer_sesskey(int, struct sshbuf *);
122: int mm_answer_sessid(int, struct sshbuf *);
1.1 provos 123:
1.46 markus 124: #ifdef GSSAPI
1.183 markus 125: int mm_answer_gss_setup_ctx(int, struct sshbuf *);
126: int mm_answer_gss_accept_ctx(int, struct sshbuf *);
127: int mm_answer_gss_userok(int, struct sshbuf *);
128: int mm_answer_gss_checkmic(int, struct sshbuf *);
1.46 markus 129: #endif
1.25 itojun 130:
1.114 djm 131: static int monitor_read_log(struct monitor *);
132:
1.1 provos 133: static Authctxt *authctxt;
1.132 markus 134:
1.1 provos 135: /* local state for key verify */
136: static u_char *key_blob = NULL;
1.183 markus 137: static size_t key_bloblen = 0;
1.1 provos 138: static int key_blobtype = MM_NOKEY;
1.180 djm 139: static struct sshauthopt *key_opts = NULL;
1.26 markus 140: static char *hostbased_cuser = NULL;
141: static char *hostbased_chost = NULL;
1.1 provos 142: static char *auth_method = "unknown";
1.119 djm 143: static char *auth_submethod = NULL;
1.44 markus 144: static u_int session_id2_len = 0;
1.13 markus 145: static u_char *session_id2 = NULL;
1.40 markus 146: static pid_t monitor_child_pid;
1.1 provos 147:
148: struct mon_table {
149: enum monitor_reqtype type;
150: int flags;
1.183 markus 151: int (*f)(int, struct sshbuf *);
1.1 provos 152: };
153:
154: #define MON_ISAUTH 0x0004 /* Required for Authentication */
155: #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
156: #define MON_ONCE 0x0010 /* Disable after calling */
1.77 dtucker 157: #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */
1.1 provos 158:
159: #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
160:
161: #define MON_PERMIT 0x1000 /* Request is permitted */
162:
163: struct mon_table mon_dispatch_proto20[] = {
1.132 markus 164: #ifdef WITH_OPENSSL
1.1 provos 165: {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
1.132 markus 166: #endif
1.1 provos 167: {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
168: {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
169: {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
1.10 djm 170: {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
1.1 provos 171: {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
172: {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
1.66 stevesk 173: {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
1.1 provos 174: {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
175: {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
1.46 markus 176: #ifdef GSSAPI
177: {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
1.165 djm 178: {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
179: {MONITOR_REQ_GSSUSEROK, MON_ONCE|MON_AUTHDECIDE, mm_answer_gss_userok},
180: {MONITOR_REQ_GSSCHECKMIC, MON_ONCE, mm_answer_gss_checkmic},
1.46 markus 181: #endif
1.1 provos 182: {0, 0, NULL}
183: };
184:
185: struct mon_table mon_dispatch_postauth20[] = {
1.132 markus 186: #ifdef WITH_OPENSSL
1.1 provos 187: {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
1.132 markus 188: #endif
1.1 provos 189: {MONITOR_REQ_SIGN, 0, mm_answer_sign},
190: {MONITOR_REQ_PTY, 0, mm_answer_pty},
191: {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
192: {MONITOR_REQ_TERM, 0, mm_answer_term},
193: {0, 0, NULL}
194: };
195:
196: struct mon_table *mon_dispatch;
197:
198: /* Specifies if a certain message is allowed at the moment */
199: static void
200: monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
201: {
202: while (ent->f != NULL) {
203: if (ent->type == type) {
204: ent->flags &= ~MON_PERMIT;
205: ent->flags |= permit ? MON_PERMIT : 0;
206: return;
207: }
208: ent++;
209: }
210: }
211:
212: static void
213: monitor_permit_authentications(int permit)
214: {
215: struct mon_table *ent = mon_dispatch;
216:
217: while (ent->f != NULL) {
218: if (ent->flags & MON_AUTH) {
219: ent->flags &= ~MON_PERMIT;
220: ent->flags |= permit ? MON_PERMIT : 0;
221: }
222: ent++;
223: }
224: }
225:
1.50 markus 226: void
227: monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
1.1 provos 228: {
1.167 djm 229: struct ssh *ssh = active_state; /* XXX */
1.1 provos 230: struct mon_table *ent;
1.119 djm 231: int authenticated = 0, partial = 0;
1.1 provos 232:
233: debug3("preauth child monitor started");
234:
1.179 tb 235: if (pmonitor->m_recvfd >= 0)
236: close(pmonitor->m_recvfd);
237: if (pmonitor->m_log_sendfd >= 0)
238: close(pmonitor->m_log_sendfd);
1.114 djm 239: pmonitor->m_log_sendfd = pmonitor->m_recvfd = -1;
240:
1.50 markus 241: authctxt = _authctxt;
242: memset(authctxt, 0, sizeof(*authctxt));
1.180 djm 243: ssh->authctxt = authctxt;
1.50 markus 244:
1.162 markus 245: mon_dispatch = mon_dispatch_proto20;
246: /* Permit requests for moduli and signatures */
247: monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
248: monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
1.1 provos 249:
250: /* The first few requests do not require asynchronous access */
251: while (!authenticated) {
1.119 djm 252: partial = 0;
1.77 dtucker 253: auth_method = "unknown";
1.119 djm 254: auth_submethod = NULL;
1.172 djm 255: auth2_authctxt_reset_info(authctxt);
256:
1.89 markus 257: authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1);
1.118 djm 258:
259: /* Special handling for multiple required authentications */
260: if (options.num_auth_methods != 0) {
261: if (authenticated &&
262: !auth2_update_methods_lists(authctxt,
1.122 markus 263: auth_method, auth_submethod)) {
1.118 djm 264: debug3("%s: method %s: partial", __func__,
265: auth_method);
266: authenticated = 0;
1.119 djm 267: partial = 1;
1.118 djm 268: }
269: }
270:
1.1 provos 271: if (authenticated) {
272: if (!(ent->flags & MON_AUTHDECIDE))
273: fatal("%s: unexpected authentication from %d",
1.14 markus 274: __func__, ent->type);
1.1 provos 275: if (authctxt->pw->pw_uid == 0 &&
1.180 djm 276: !auth_root_allowed(ssh, auth_method))
1.1 provos 277: authenticated = 0;
278: }
1.77 dtucker 279: if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) {
1.190 ! djm 280: auth_log(ssh, authenticated, partial,
1.125 djm 281: auth_method, auth_submethod);
1.150 djm 282: if (!partial && !authenticated)
1.1 provos 283: authctxt->failures++;
1.172 djm 284: if (authenticated || partial) {
285: auth2_update_session_info(authctxt,
286: auth_method, auth_submethod);
287: }
1.1 provos 288: }
289: }
290:
291: if (!authctxt->valid)
1.14 markus 292: fatal("%s: authenticated invalid user", __func__);
1.77 dtucker 293: if (strcmp(auth_method, "unknown") == 0)
294: fatal("%s: authentication method name unknown", __func__);
1.1 provos 295:
296: debug("%s: %s has been authenticated by privileged process",
1.14 markus 297: __func__, authctxt->user);
1.180 djm 298: ssh->authctxt = NULL;
1.167 djm 299: ssh_packet_set_log_preamble(ssh, "user %s", authctxt->user);
1.1 provos 300:
1.11 mouring 301: mm_get_keystate(pmonitor);
1.120 markus 302:
303: /* Drain any buffered messages from the child */
304: while (pmonitor->m_log_recvfd != -1 && monitor_read_log(pmonitor) == 0)
305: ;
1.114 djm 306:
1.179 tb 307: if (pmonitor->m_recvfd >= 0)
308: close(pmonitor->m_recvfd);
309: if (pmonitor->m_log_sendfd >= 0)
310: close(pmonitor->m_log_sendfd);
1.114 djm 311: pmonitor->m_sendfd = pmonitor->m_log_recvfd = -1;
1.1 provos 312: }
313:
1.40 markus 314: static void
315: monitor_set_child_handler(pid_t pid)
316: {
317: monitor_child_pid = pid;
318: }
319:
320: static void
1.59 avsm 321: monitor_child_handler(int sig)
1.40 markus 322: {
1.59 avsm 323: kill(monitor_child_pid, sig);
1.40 markus 324: }
325:
1.1 provos 326: void
1.11 mouring 327: monitor_child_postauth(struct monitor *pmonitor)
1.1 provos 328: {
1.114 djm 329: close(pmonitor->m_recvfd);
330: pmonitor->m_recvfd = -1;
331:
1.40 markus 332: monitor_set_child_handler(pmonitor->m_pid);
333: signal(SIGHUP, &monitor_child_handler);
334: signal(SIGTERM, &monitor_child_handler);
1.91 djm 335: signal(SIGINT, &monitor_child_handler);
1.40 markus 336:
1.162 markus 337: mon_dispatch = mon_dispatch_postauth20;
338:
339: /* Permit requests for moduli and signatures */
340: monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
341: monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
342: monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
1.1 provos 343:
1.180 djm 344: if (auth_opts->permit_pty_flag) {
1.1 provos 345: monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
346: monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
347: }
348:
349: for (;;)
1.11 mouring 350: monitor_read(pmonitor, mon_dispatch, NULL);
1.1 provos 351: }
352:
1.114 djm 353: static int
354: monitor_read_log(struct monitor *pmonitor)
355: {
1.183 markus 356: struct sshbuf *logmsg;
1.114 djm 357: u_int len, level;
358: char *msg;
1.183 markus 359: u_char *p;
360: int r;
1.114 djm 361:
1.183 markus 362: if ((logmsg = sshbuf_new()) == NULL)
363: fatal("%s: sshbuf_new", __func__);
1.114 djm 364:
365: /* Read length */
1.183 markus 366: if ((r = sshbuf_reserve(logmsg, 4, &p)) != 0)
367: fatal("%s: reserve: %s", __func__, ssh_err(r));
368: if (atomicio(read, pmonitor->m_log_recvfd, p, 4) != 4) {
1.114 djm 369: if (errno == EPIPE) {
1.183 markus 370: sshbuf_free(logmsg);
1.114 djm 371: debug("%s: child log fd closed", __func__);
372: close(pmonitor->m_log_recvfd);
373: pmonitor->m_log_recvfd = -1;
374: return -1;
375: }
376: fatal("%s: log fd read: %s", __func__, strerror(errno));
377: }
1.183 markus 378: if ((r = sshbuf_get_u32(logmsg, &len)) != 0)
379: fatal("%s: get len: %s", __func__, ssh_err(r));
1.114 djm 380: if (len <= 4 || len > 8192)
381: fatal("%s: invalid log message length %u", __func__, len);
382:
383: /* Read severity, message */
1.183 markus 384: sshbuf_reset(logmsg);
385: if ((r = sshbuf_reserve(logmsg, len, &p)) != 0)
386: fatal("%s: reserve: %s", __func__, ssh_err(r));
387: if (atomicio(read, pmonitor->m_log_recvfd, p, len) != len)
1.114 djm 388: fatal("%s: log fd read: %s", __func__, strerror(errno));
1.183 markus 389: if ((r = sshbuf_get_u32(logmsg, &level)) != 0 ||
390: (r = sshbuf_get_cstring(logmsg, &msg, NULL)) != 0)
391: fatal("%s: decode: %s", __func__, ssh_err(r));
1.114 djm 392:
393: /* Log it */
394: if (log_level_name(level) == NULL)
395: fatal("%s: invalid log level %u (corrupted message?)",
396: __func__, level);
397: do_log2(level, "%s [preauth]", msg);
398:
1.183 markus 399: sshbuf_free(logmsg);
1.124 djm 400: free(msg);
1.114 djm 401:
402: return 0;
403: }
404:
1.1 provos 405: int
1.11 mouring 406: monitor_read(struct monitor *pmonitor, struct mon_table *ent,
1.1 provos 407: struct mon_table **pent)
408: {
1.183 markus 409: struct sshbuf *m;
410: int r, ret;
1.1 provos 411: u_char type;
1.114 djm 412: struct pollfd pfd[2];
413:
414: for (;;) {
1.130 tedu 415: memset(&pfd, 0, sizeof(pfd));
1.114 djm 416: pfd[0].fd = pmonitor->m_sendfd;
417: pfd[0].events = POLLIN;
418: pfd[1].fd = pmonitor->m_log_recvfd;
419: pfd[1].events = pfd[1].fd == -1 ? 0 : POLLIN;
1.115 djm 420: if (poll(pfd, pfd[1].fd == -1 ? 1 : 2, -1) == -1) {
421: if (errno == EINTR || errno == EAGAIN)
422: continue;
1.114 djm 423: fatal("%s: poll: %s", __func__, strerror(errno));
1.115 djm 424: }
1.114 djm 425: if (pfd[1].revents) {
426: /*
427: * Drain all log messages before processing next
428: * monitor request.
429: */
430: monitor_read_log(pmonitor);
431: continue;
432: }
433: if (pfd[0].revents)
434: break; /* Continues below */
435: }
1.1 provos 436:
1.183 markus 437: if ((m = sshbuf_new()) == NULL)
438: fatal("%s: sshbuf_new", __func__);
1.1 provos 439:
1.183 markus 440: mm_request_receive(pmonitor->m_sendfd, m);
441: if ((r = sshbuf_get_u8(m, &type)) != 0)
442: fatal("%s: decode: %s", __func__, ssh_err(r));
1.1 provos 443:
1.14 markus 444: debug3("%s: checking request %d", __func__, type);
1.1 provos 445:
446: while (ent->f != NULL) {
447: if (ent->type == type)
448: break;
449: ent++;
450: }
451:
452: if (ent->f != NULL) {
453: if (!(ent->flags & MON_PERMIT))
1.14 markus 454: fatal("%s: unpermitted request %d", __func__,
1.1 provos 455: type);
1.183 markus 456: ret = (*ent->f)(pmonitor->m_sendfd, m);
457: sshbuf_free(m);
1.1 provos 458:
459: /* The child may use this request only once, disable it */
460: if (ent->flags & MON_ONCE) {
1.14 markus 461: debug2("%s: %d used once, disabling now", __func__,
1.1 provos 462: type);
463: ent->flags &= ~MON_PERMIT;
464: }
465:
466: if (pent != NULL)
467: *pent = ent;
1.3 markus 468:
1.1 provos 469: return ret;
470: }
471:
1.14 markus 472: fatal("%s: unsupported request: %d", __func__, type);
1.1 provos 473:
474: /* NOTREACHED */
475: return (-1);
476: }
477:
478: /* allowed key state */
479: static int
480: monitor_allowed_key(u_char *blob, u_int bloblen)
481: {
482: /* make sure key is allowed */
483: if (key_blob == NULL || key_bloblen != bloblen ||
1.108 djm 484: timingsafe_bcmp(key_blob, blob, key_bloblen))
1.1 provos 485: return (0);
486: return (1);
487: }
488:
489: static void
490: monitor_reset_key_state(void)
491: {
492: /* reset state */
1.124 djm 493: free(key_blob);
494: free(hostbased_cuser);
495: free(hostbased_chost);
1.180 djm 496: sshauthopt_free(key_opts);
1.1 provos 497: key_blob = NULL;
498: key_bloblen = 0;
499: key_blobtype = MM_NOKEY;
1.180 djm 500: key_opts = NULL;
1.1 provos 501: hostbased_cuser = NULL;
502: hostbased_chost = NULL;
503: }
504:
1.132 markus 505: #ifdef WITH_OPENSSL
1.1 provos 506: int
1.183 markus 507: mm_answer_moduli(int sock, struct sshbuf *m)
1.1 provos 508: {
509: DH *dh;
1.187 djm 510: const BIGNUM *dh_p, *dh_g;
1.183 markus 511: int r;
512: u_int min, want, max;
1.1 provos 513:
1.183 markus 514: if ((r = sshbuf_get_u32(m, &min)) != 0 ||
515: (r = sshbuf_get_u32(m, &want)) != 0 ||
516: (r = sshbuf_get_u32(m, &max)) != 0)
517: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 518:
519: debug3("%s: got parameters: %d %d %d",
1.14 markus 520: __func__, min, want, max);
1.1 provos 521: /* We need to check here, too, in case the child got corrupted */
522: if (max < min || want < min || max < want)
523: fatal("%s: bad parameters: %d %d %d",
1.14 markus 524: __func__, min, want, max);
1.1 provos 525:
1.183 markus 526: sshbuf_reset(m);
1.1 provos 527:
528: dh = choose_dh(min, want, max);
529: if (dh == NULL) {
1.183 markus 530: if ((r = sshbuf_put_u8(m, 0)) != 0)
531: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 532: return (0);
533: } else {
534: /* Send first bignum */
1.187 djm 535: DH_get0_pqg(dh, &dh_p, NULL, &dh_g);
1.183 markus 536: if ((r = sshbuf_put_u8(m, 1)) != 0 ||
1.187 djm 537: (r = sshbuf_put_bignum2(m, dh_p)) != 0 ||
538: (r = sshbuf_put_bignum2(m, dh_g)) != 0)
1.183 markus 539: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.3 markus 540:
1.1 provos 541: DH_free(dh);
542: }
1.59 avsm 543: mm_request_send(sock, MONITOR_ANS_MODULI, m);
1.1 provos 544: return (0);
545: }
1.132 markus 546: #endif
1.1 provos 547:
548: int
1.183 markus 549: mm_answer_sign(int sock, struct sshbuf *m)
1.1 provos 550: {
1.144 djm 551: struct ssh *ssh = active_state; /* XXX */
1.138 djm 552: extern int auth_sock; /* XXX move to state struct? */
553: struct sshkey *key;
1.157 djm 554: struct sshbuf *sigbuf = NULL;
555: u_char *p = NULL, *signature = NULL;
556: char *alg = NULL;
1.155 markus 557: size_t datlen, siglen, alglen;
1.159 djm 558: int r, is_proof = 0;
1.185 markus 559: u_int keyid, compat;
1.145 djm 560: const char proof_req[] = "hostkeys-prove-00@openssh.com";
1.3 markus 561:
1.14 markus 562: debug3("%s", __func__);
1.1 provos 563:
1.138 djm 564: if ((r = sshbuf_get_u32(m, &keyid)) != 0 ||
1.155 markus 565: (r = sshbuf_get_string(m, &p, &datlen)) != 0 ||
1.185 markus 566: (r = sshbuf_get_cstring(m, &alg, &alglen)) != 0 ||
567: (r = sshbuf_get_u32(m, &compat)) != 0)
1.138 djm 568: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.159 djm 569: if (keyid > INT_MAX)
570: fatal("%s: invalid key ID", __func__);
1.1 provos 571:
1.69 djm 572: /*
1.110 djm 573: * Supported KEX types use SHA1 (20 bytes), SHA256 (32 bytes),
574: * SHA384 (48 bytes) and SHA512 (64 bytes).
1.144 djm 575: *
576: * Otherwise, verify the signature request is for a hostkey
577: * proof.
578: *
579: * XXX perform similar check for KEX signature requests too?
580: * it's not trivial, since what is signed is the hash, rather
581: * than the full kex structure...
1.69 djm 582: */
1.144 djm 583: if (datlen != 20 && datlen != 32 && datlen != 48 && datlen != 64) {
584: /*
585: * Construct expected hostkey proof and compare it to what
586: * the client sent us.
587: */
588: if (session_id2_len == 0) /* hostkeys is never first */
589: fatal("%s: bad data length: %zu", __func__, datlen);
590: if ((key = get_hostkey_public_by_index(keyid, ssh)) == NULL)
591: fatal("%s: no hostkey for index %d", __func__, keyid);
592: if ((sigbuf = sshbuf_new()) == NULL)
593: fatal("%s: sshbuf_new", __func__);
1.145 djm 594: if ((r = sshbuf_put_cstring(sigbuf, proof_req)) != 0 ||
595: (r = sshbuf_put_string(sigbuf, session_id2,
1.152 jsg 596: session_id2_len)) != 0 ||
1.144 djm 597: (r = sshkey_puts(key, sigbuf)) != 0)
598: fatal("%s: couldn't prepare private key "
599: "proof buffer: %s", __func__, ssh_err(r));
600: if (datlen != sshbuf_len(sigbuf) ||
601: memcmp(p, sshbuf_ptr(sigbuf), sshbuf_len(sigbuf)) != 0)
602: fatal("%s: bad data length: %zu, hostkey proof len %zu",
603: __func__, datlen, sshbuf_len(sigbuf));
604: sshbuf_free(sigbuf);
605: is_proof = 1;
606: }
1.1 provos 607:
1.13 markus 608: /* save session id, it will be passed on the first call */
609: if (session_id2_len == 0) {
610: session_id2_len = datlen;
611: session_id2 = xmalloc(session_id2_len);
612: memcpy(session_id2, p, session_id2_len);
613: }
614:
1.127 markus 615: if ((key = get_hostkey_by_index(keyid)) != NULL) {
1.155 markus 616: if ((r = sshkey_sign(key, &signature, &siglen, p, datlen, alg,
1.185 markus 617: compat)) != 0)
1.138 djm 618: fatal("%s: sshkey_sign failed: %s",
619: __func__, ssh_err(r));
1.144 djm 620: } else if ((key = get_hostkey_public_by_index(keyid, ssh)) != NULL &&
1.138 djm 621: auth_sock > 0) {
622: if ((r = ssh_agent_sign(auth_sock, key, &signature, &siglen,
1.185 markus 623: p, datlen, alg, compat)) != 0) {
1.138 djm 624: fatal("%s: ssh_agent_sign failed: %s",
625: __func__, ssh_err(r));
626: }
1.127 markus 627: } else
1.14 markus 628: fatal("%s: no hostkey from index %d", __func__, keyid);
1.1 provos 629:
1.144 djm 630: debug3("%s: %s signature %p(%zu)", __func__,
631: is_proof ? "KEX" : "hostkey proof", signature, siglen);
1.1 provos 632:
1.138 djm 633: sshbuf_reset(m);
634: if ((r = sshbuf_put_string(m, signature, siglen)) != 0)
635: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 636:
1.157 djm 637: free(alg);
1.124 djm 638: free(p);
639: free(signature);
1.1 provos 640:
1.59 avsm 641: mm_request_send(sock, MONITOR_ANS_SIGN, m);
1.1 provos 642:
643: /* Turn on permissions for getpwnam */
644: monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
645:
646: return (0);
647: }
648:
649: /* Retrieves the password entry and also checks if the user is permitted */
650:
651: int
1.183 markus 652: mm_answer_pwnamallow(int sock, struct sshbuf *m)
1.1 provos 653: {
1.167 djm 654: struct ssh *ssh = active_state; /* XXX */
1.60 dtucker 655: char *username;
1.1 provos 656: struct passwd *pwent;
1.183 markus 657: int r, 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:
1.183 markus 665: if ((r = sshbuf_get_cstring(m, &username, NULL)) != 0)
666: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 667:
1.190 ! djm 668: pwent = getpwnamallow(ssh, username);
1.1 provos 669:
1.60 dtucker 670: authctxt->user = xstrdup(username);
671: setproctitle("%s [priv]", pwent ? username : "unknown");
1.124 djm 672: free(username);
1.1 provos 673:
1.183 markus 674: sshbuf_reset(m);
1.1 provos 675:
676: if (pwent == NULL) {
1.183 markus 677: if ((r = sshbuf_put_u8(m, 0)) != 0)
678: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.53 djm 679: authctxt->pw = fakepw();
1.1 provos 680: goto out;
681: }
682:
683: allowed = 1;
1.4 markus 684: authctxt->pw = pwent;
1.1 provos 685: authctxt->valid = 1;
686:
1.183 markus 687: /* XXX don't sent pwent to unpriv; send fake class/dir/shell too */
688: if ((r = sshbuf_put_u8(m, 1)) != 0 ||
689: (r = sshbuf_put_string(m, pwent, sizeof(*pwent))) != 0 ||
690: (r = sshbuf_put_cstring(m, pwent->pw_name)) != 0 ||
691: (r = sshbuf_put_cstring(m, "*")) != 0 ||
692: (r = sshbuf_put_cstring(m, pwent->pw_gecos)) != 0 ||
693: (r = sshbuf_put_cstring(m, pwent->pw_class)) != 0 ||
694: (r = sshbuf_put_cstring(m, pwent->pw_dir)) != 0 ||
695: (r = sshbuf_put_cstring(m, pwent->pw_shell)) != 0)
696: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.94 dtucker 697:
698: out:
1.167 djm 699: ssh_packet_set_log_preamble(ssh, "%suser %s",
700: authctxt->valid ? "authenticating" : "invalid ", authctxt->user);
1.183 markus 701: if ((r = sshbuf_put_string(m, &options, sizeof(options))) != 0)
702: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.112 djm 703:
704: #define M_CP_STROPT(x) do { \
1.183 markus 705: if (options.x != NULL) { \
706: if ((r = sshbuf_put_cstring(m, options.x)) != 0) \
707: fatal("%s: buffer error: %s", \
708: __func__, ssh_err(r)); \
709: } \
1.112 djm 710: } while (0)
1.113 djm 711: #define M_CP_STRARRAYOPT(x, nx) do { \
1.183 markus 712: for (i = 0; i < options.nx; i++) { \
713: if ((r = sshbuf_put_cstring(m, options.x[i])) != 0) \
714: fatal("%s: buffer error: %s", \
715: __func__, ssh_err(r)); \
716: } \
1.113 djm 717: } while (0)
1.112 djm 718: /* See comment in servconf.h */
719: COPY_MATCH_STRING_OPTS();
720: #undef M_CP_STROPT
1.113 djm 721: #undef M_CP_STRARRAYOPT
1.118 djm 722:
723: /* Create valid auth method lists */
1.162 markus 724: if (auth2_setup_methods_lists(authctxt) != 0) {
1.118 djm 725: /*
726: * The monitor will continue long enough to let the child
727: * run to it's packet_disconnect(), but it must not allow any
728: * authentication to succeed.
729: */
730: debug("%s: no valid authentication method lists", __func__);
731: }
732:
1.14 markus 733: debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
1.59 avsm 734: mm_request_send(sock, MONITOR_ANS_PWNAM, m);
1.1 provos 735:
1.162 markus 736: /* Allow service/style information on the auth context */
737: monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
738: monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
1.10 djm 739:
740: return (0);
741: }
742:
1.183 markus 743: int mm_answer_auth2_read_banner(int sock, struct sshbuf *m)
1.10 djm 744: {
745: char *banner;
1.183 markus 746: int r;
1.10 djm 747:
1.183 markus 748: sshbuf_reset(m);
1.10 djm 749: banner = auth2_read_banner();
1.183 markus 750: if ((r = sshbuf_put_cstring(m, banner != NULL ? banner : "")) != 0)
751: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.59 avsm 752: mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
1.124 djm 753: free(banner);
1.1 provos 754:
755: return (0);
756: }
757:
758: int
1.183 markus 759: mm_answer_authserv(int sock, struct sshbuf *m)
1.1 provos 760: {
1.183 markus 761: int r;
762:
1.1 provos 763: monitor_permit_authentications(1);
764:
1.183 markus 765: if ((r = sshbuf_get_cstring(m, &authctxt->service, NULL)) != 0 ||
766: (r = sshbuf_get_cstring(m, &authctxt->style, NULL)) != 0)
767: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.6 stevesk 768: debug3("%s: service=%s, style=%s",
1.14 markus 769: __func__, authctxt->service, authctxt->style);
1.6 stevesk 770:
1.1 provos 771: if (strlen(authctxt->style) == 0) {
1.124 djm 772: free(authctxt->style);
1.1 provos 773: authctxt->style = NULL;
774: }
775:
776: return (0);
777: }
778:
779: int
1.183 markus 780: mm_answer_authpassword(int sock, struct sshbuf *m)
1.1 provos 781: {
1.180 djm 782: struct ssh *ssh = active_state; /* XXX */
1.1 provos 783: static int call_count;
784: char *passwd;
1.183 markus 785: int r, authenticated;
786: size_t plen;
1.1 provos 787:
1.164 djm 788: if (!options.password_authentication)
789: fatal("%s: password authentication not enabled", __func__);
1.183 markus 790: if ((r = sshbuf_get_cstring(m, &passwd, &plen)) != 0)
791: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 792: /* Only authenticate if the context is valid */
1.12 markus 793: authenticated = options.password_authentication &&
1.180 djm 794: auth_password(ssh, passwd);
1.183 markus 795: explicit_bzero(passwd, plen);
1.124 djm 796: free(passwd);
1.1 provos 797:
1.183 markus 798: sshbuf_reset(m);
799: if ((r = sshbuf_put_u32(m, authenticated)) != 0)
800: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 801:
1.14 markus 802: debug3("%s: sending result %d", __func__, authenticated);
1.59 avsm 803: mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
1.1 provos 804:
805: call_count++;
806: if (plen == 0 && call_count == 1)
807: auth_method = "none";
808: else
809: auth_method = "password";
810:
811: /* Causes monitor loop to terminate if authenticated */
812: return (authenticated);
813: }
814:
815: int
1.183 markus 816: mm_answer_bsdauthquery(int sock, struct sshbuf *m)
1.1 provos 817: {
818: char *name, *infotxt;
1.183 markus 819: u_int numprompts, *echo_on, success;
1.1 provos 820: char **prompts;
1.183 markus 821: int r;
1.1 provos 822:
1.164 djm 823: if (!options.kbd_interactive_authentication)
824: fatal("%s: kbd-int authentication not enabled", __func__);
1.31 markus 825: success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
826: &prompts, &echo_on) < 0 ? 0 : 1;
1.1 provos 827:
1.183 markus 828: sshbuf_reset(m);
829: if ((r = sshbuf_put_u32(m, success)) != 0)
830: fatal("%s: buffer error: %s", __func__, ssh_err(r));
831: if (success) {
832: if ((r = sshbuf_put_cstring(m, prompts[0])) != 0)
833: fatal("%s: buffer error: %s", __func__, ssh_err(r));
834: }
1.1 provos 835:
1.31 markus 836: debug3("%s: sending challenge success: %u", __func__, success);
1.59 avsm 837: mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
1.1 provos 838:
1.31 markus 839: if (success) {
1.124 djm 840: free(name);
841: free(infotxt);
842: free(prompts);
843: free(echo_on);
1.1 provos 844: }
845:
846: return (0);
847: }
848:
849: int
1.183 markus 850: mm_answer_bsdauthrespond(int sock, struct sshbuf *m)
1.1 provos 851: {
852: char *response;
1.183 markus 853: int r, authok;
1.1 provos 854:
1.164 djm 855: if (!options.kbd_interactive_authentication)
856: fatal("%s: kbd-int authentication not enabled", __func__);
1.154 mmcc 857: if (authctxt->as == NULL)
1.14 markus 858: fatal("%s: no bsd auth session", __func__);
1.1 provos 859:
1.183 markus 860: if ((r = sshbuf_get_cstring(m, &response, NULL)) != 0)
861: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.12 markus 862: authok = options.challenge_response_authentication &&
863: auth_userresponse(authctxt->as, response, 0);
1.1 provos 864: authctxt->as = NULL;
1.14 markus 865: debug3("%s: <%s> = <%d>", __func__, response, authok);
1.124 djm 866: free(response);
1.1 provos 867:
1.183 markus 868: sshbuf_reset(m);
869: if ((r = sshbuf_put_u32(m, authok)) != 0)
870: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 871:
1.14 markus 872: debug3("%s: sending authenticated: %d", __func__, authok);
1.59 avsm 873: mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
1.1 provos 874:
1.162 markus 875: auth_method = "keyboard-interactive";
876: auth_submethod = "bsdauth";
1.1 provos 877:
878: return (authok != 0);
879: }
880:
1.188 djm 881: /*
882: * Check that the key type appears in the supplied pattern list, ignoring
883: * mismatches in the signature algorithm. (Signature algorithm checks are
884: * performed in the unprivileged authentication code).
885: * Returns 1 on success, 0 otherwise.
886: */
887: static int
888: key_base_type_match(const char *method, const struct sshkey *key,
889: const char *list)
890: {
891: char *s, *l, *ol = xstrdup(list);
892: int found = 0;
893:
894: l = ol;
895: for ((s = strsep(&l, ",")); s && *s != '\0'; (s = strsep(&l, ","))) {
896: if (sshkey_type_from_name(s) == key->type) {
897: found = 1;
898: break;
899: }
900: }
901: if (!found) {
902: error("%s key type %s is not in permitted list %s", method,
903: sshkey_ssh_name(key), list);
904: }
905:
906: free(ol);
907: return found;
908: }
909:
1.1 provos 910: int
1.183 markus 911: mm_answer_keyallowed(int sock, struct sshbuf *m)
1.1 provos 912: {
1.180 djm 913: struct ssh *ssh = active_state; /* XXX */
1.183 markus 914: struct sshkey *key = NULL;
1.26 markus 915: char *cuser, *chost;
1.183 markus 916: u_int pubkey_auth_attempt;
1.1 provos 917: enum mm_keytype type = 0;
1.180 djm 918: int r, allowed = 0;
919: struct sshauthopt *opts = NULL;
1.1 provos 920:
1.14 markus 921: debug3("%s entering", __func__);
1.183 markus 922: if ((r = sshbuf_get_u32(m, &type)) != 0 ||
923: (r = sshbuf_get_cstring(m, &cuser, NULL)) != 0 ||
924: (r = sshbuf_get_cstring(m, &chost, NULL)) != 0 ||
925: (r = sshkey_froms(m, &key)) != 0 ||
926: (r = sshbuf_get_u32(m, &pubkey_auth_attempt)) != 0)
927: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 928:
1.14 markus 929: debug3("%s: key_from_blob: %p", __func__, key);
1.1 provos 930:
1.51 djm 931: if (key != NULL && authctxt->valid) {
1.137 djm 932: /* These should not make it past the privsep child */
1.185 markus 933: if (sshkey_type_plain(key->type) == KEY_RSA &&
1.137 djm 934: (datafellows & SSH_BUG_RSASIGMD5) != 0)
935: fatal("%s: passed a SSH_BUG_RSASIGMD5 key", __func__);
936:
1.63 deraadt 937: switch (type) {
1.1 provos 938: case MM_USERKEY:
1.77 dtucker 939: auth_method = "publickey";
1.180 djm 940: if (!options.pubkey_authentication)
941: break;
942: if (auth2_key_already_used(authctxt, key))
943: break;
1.188 djm 944: if (!key_base_type_match(auth_method, key,
945: options.pubkey_key_types))
1.180 djm 946: break;
947: allowed = user_key_allowed(ssh, authctxt->pw, key,
948: pubkey_auth_attempt, &opts);
1.1 provos 949: break;
950: case MM_HOSTKEY:
1.180 djm 951: auth_method = "hostbased";
952: if (!options.hostbased_authentication)
953: break;
954: if (auth2_key_already_used(authctxt, key))
955: break;
1.188 djm 956: if (!key_base_type_match(auth_method, key,
957: options.hostbased_key_types))
1.180 djm 958: break;
959: allowed = hostbased_key_allowed(authctxt->pw,
1.1 provos 960: cuser, chost, key);
1.172 djm 961: auth2_record_info(authctxt,
1.126 djm 962: "client user \"%.100s\", client host \"%.100s\"",
963: cuser, chost);
1.1 provos 964: break;
965: default:
1.14 markus 966: fatal("%s: unknown key type %d", __func__, type);
1.1 provos 967: break;
968: }
1.33 markus 969: }
1.161 djm 970:
1.180 djm 971: debug3("%s: %s authentication%s: %s key is %s", __func__,
972: auth_method, pubkey_auth_attempt ? "" : " test",
973: (key == NULL || !authctxt->valid) ? "invalid" : sshkey_type(key),
974: allowed ? "allowed" : "not allowed");
1.161 djm 975:
1.172 djm 976: auth2_record_key(authctxt, 0, key);
1.1 provos 977:
978: /* clear temporarily storage (used by verify) */
979: monitor_reset_key_state();
980:
981: if (allowed) {
982: /* Save temporarily for comparison in verify */
1.183 markus 983: if ((r = sshkey_to_blob(key, &key_blob, &key_bloblen)) != 0)
984: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 985: key_blobtype = type;
1.180 djm 986: key_opts = opts;
1.1 provos 987: hostbased_cuser = cuser;
988: hostbased_chost = chost;
1.72 djm 989: } else {
1.77 dtucker 990: /* Log failed attempt */
1.190 ! djm 991: auth_log(ssh, 0, 0, auth_method, NULL);
1.124 djm 992: free(cuser);
993: free(chost);
1.1 provos 994: }
1.183 markus 995: sshkey_free(key);
1.1 provos 996:
1.183 markus 997: sshbuf_reset(m);
998: if ((r = sshbuf_put_u32(m, allowed)) != 0)
999: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.180 djm 1000: if (opts != NULL && (r = sshauthopt_serialise(opts, m, 1)) != 0)
1001: fatal("%s: sshauthopt_serialise: %s", __func__, ssh_err(r));
1002: mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
1.1 provos 1003:
1.180 djm 1004: if (!allowed)
1005: sshauthopt_free(opts);
1.1 provos 1006:
1007: return (0);
1008: }
1009:
1010: static int
1011: monitor_valid_userblob(u_char *data, u_int datalen)
1012: {
1.183 markus 1013: struct sshbuf *b;
1014: const u_char *p;
1.159 djm 1015: char *userstyle, *cp;
1.183 markus 1016: size_t len;
1017: u_char type;
1018: int r, fail = 0;
1.1 provos 1019:
1.183 markus 1020: if ((b = sshbuf_new()) == NULL)
1021: fatal("%s: sshbuf_new", __func__);
1022: if ((r = sshbuf_put(b, data, datalen)) != 0)
1023: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.3 markus 1024:
1.1 provos 1025: if (datafellows & SSH_OLD_SESSIONID) {
1.183 markus 1026: p = sshbuf_ptr(b);
1027: len = sshbuf_len(b);
1.13 markus 1028: if ((session_id2 == NULL) ||
1029: (len < session_id2_len) ||
1.108 djm 1030: (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1.13 markus 1031: fail++;
1.183 markus 1032: if ((r = sshbuf_consume(b, session_id2_len)) != 0)
1033: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 1034: } else {
1.183 markus 1035: if ((r = sshbuf_get_string_direct(b, &p, &len)) != 0)
1036: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.13 markus 1037: if ((session_id2 == NULL) ||
1038: (len != session_id2_len) ||
1.108 djm 1039: (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1.1 provos 1040: fail++;
1041: }
1.183 markus 1042: if ((r = sshbuf_get_u8(b, &type)) != 0)
1043: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1044: if (type != SSH2_MSG_USERAUTH_REQUEST)
1.1 provos 1045: fail++;
1.183 markus 1046: if ((r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
1047: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.121 djm 1048: xasprintf(&userstyle, "%s%s%s", authctxt->user,
1049: authctxt->style ? ":" : "",
1050: authctxt->style ? authctxt->style : "");
1.159 djm 1051: if (strcmp(userstyle, cp) != 0) {
1052: logit("wrong user name passed to monitor: "
1053: "expected %s != %.100s", userstyle, cp);
1.1 provos 1054: fail++;
1055: }
1.124 djm 1056: free(userstyle);
1.159 djm 1057: free(cp);
1.183 markus 1058: if ((r = sshbuf_skip_string(b)) != 0 || /* service */
1059: (r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
1060: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.178 djm 1061: if (strcmp("publickey", cp) != 0)
1062: fail++;
1063: free(cp);
1.183 markus 1064: if ((r = sshbuf_get_u8(b, &type)) != 0)
1065: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1066: if (type == 0)
1.178 djm 1067: fail++;
1.183 markus 1068: if ((r = sshbuf_skip_string(b)) != 0 || /* pkalg */
1069: (r = sshbuf_skip_string(b)) != 0) /* pkblob */
1070: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1071: if (sshbuf_len(b) != 0)
1.1 provos 1072: fail++;
1.183 markus 1073: sshbuf_free(b);
1.1 provos 1074: return (fail == 0);
1075: }
1076:
1077: static int
1.26 markus 1078: monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1079: char *chost)
1.1 provos 1080: {
1.183 markus 1081: struct sshbuf *b;
1082: const u_char *p;
1083: char *cp, *userstyle;
1084: size_t len;
1085: int r, fail = 0;
1086: u_char type;
1.1 provos 1087:
1.183 markus 1088: if ((b = sshbuf_new()) == NULL)
1089: fatal("%s: sshbuf_new", __func__);
1090: if ((r = sshbuf_put(b, data, datalen)) != 0 ||
1091: (r = sshbuf_get_string_direct(b, &p, &len)) != 0)
1092: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.3 markus 1093:
1.13 markus 1094: if ((session_id2 == NULL) ||
1095: (len != session_id2_len) ||
1.108 djm 1096: (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1.1 provos 1097: fail++;
1.13 markus 1098:
1.183 markus 1099: if ((r = sshbuf_get_u8(b, &type)) != 0)
1100: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1101: if (type != SSH2_MSG_USERAUTH_REQUEST)
1.1 provos 1102: fail++;
1.183 markus 1103: if ((r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
1104: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.121 djm 1105: xasprintf(&userstyle, "%s%s%s", authctxt->user,
1106: authctxt->style ? ":" : "",
1107: authctxt->style ? authctxt->style : "");
1.183 markus 1108: if (strcmp(userstyle, cp) != 0) {
1109: logit("wrong user name passed to monitor: "
1110: "expected %s != %.100s", userstyle, cp);
1.1 provos 1111: fail++;
1112: }
1.121 djm 1113: free(userstyle);
1.183 markus 1114: free(cp);
1115: if ((r = sshbuf_skip_string(b)) != 0 || /* service */
1116: (r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
1117: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1118: if (strcmp(cp, "hostbased") != 0)
1.1 provos 1119: fail++;
1.183 markus 1120: free(cp);
1121: if ((r = sshbuf_skip_string(b)) != 0 || /* pkalg */
1122: (r = sshbuf_skip_string(b)) != 0) /* pkblob */
1123: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 1124:
1125: /* verify client host, strip trailing dot if necessary */
1.183 markus 1126: if ((r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
1127: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1128: if (((len = strlen(cp)) > 0) && cp[len - 1] == '.')
1129: cp[len - 1] = '\0';
1130: if (strcmp(cp, chost) != 0)
1.1 provos 1131: fail++;
1.183 markus 1132: free(cp);
1.1 provos 1133:
1134: /* verify client user */
1.183 markus 1135: if ((r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
1136: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1137: if (strcmp(cp, cuser) != 0)
1.1 provos 1138: fail++;
1.183 markus 1139: free(cp);
1.1 provos 1140:
1.183 markus 1141: if (sshbuf_len(b) != 0)
1.1 provos 1142: fail++;
1.183 markus 1143: sshbuf_free(b);
1.1 provos 1144: return (fail == 0);
1145: }
1146:
1147: int
1.169 markus 1148: mm_answer_keyverify(int sock, struct sshbuf *m)
1.1 provos 1149: {
1.180 djm 1150: struct ssh *ssh = active_state; /* XXX */
1.168 markus 1151: struct sshkey *key;
1.1 provos 1152: u_char *signature, *data, *blob;
1.176 djm 1153: char *sigalg;
1.169 markus 1154: size_t signaturelen, datalen, bloblen;
1155: int r, ret, valid_data = 0, encoded_ret;
1.1 provos 1156:
1.169 markus 1157: if ((r = sshbuf_get_string(m, &blob, &bloblen)) != 0 ||
1158: (r = sshbuf_get_string(m, &signature, &signaturelen)) != 0 ||
1.176 djm 1159: (r = sshbuf_get_string(m, &data, &datalen)) != 0 ||
1160: (r = sshbuf_get_cstring(m, &sigalg, NULL)) != 0)
1.169 markus 1161: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 1162:
1163: if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1.8 mouring 1164: !monitor_allowed_key(blob, bloblen))
1.14 markus 1165: fatal("%s: bad key, not previously allowed", __func__);
1.1 provos 1166:
1.177 djm 1167: /* Empty signature algorithm means NULL. */
1168: if (*sigalg == '\0') {
1169: free(sigalg);
1170: sigalg = NULL;
1171: }
1172:
1.169 markus 1173: /* XXX use sshkey_froms here; need to change key_blob, etc. */
1174: if ((r = sshkey_from_blob(blob, bloblen, &key)) != 0)
1175: fatal("%s: bad public key blob: %s", __func__, ssh_err(r));
1.1 provos 1176:
1177: switch (key_blobtype) {
1178: case MM_USERKEY:
1179: valid_data = monitor_valid_userblob(data, datalen);
1.172 djm 1180: auth_method = "publickey";
1.1 provos 1181: break;
1182: case MM_HOSTKEY:
1183: valid_data = monitor_valid_hostbasedblob(data, datalen,
1184: hostbased_cuser, hostbased_chost);
1.172 djm 1185: auth_method = "hostbased";
1.1 provos 1186: break;
1187: default:
1188: valid_data = 0;
1189: break;
1190: }
1191: if (!valid_data)
1.14 markus 1192: fatal("%s: bad signature data blob", __func__);
1.1 provos 1193:
1.169 markus 1194: ret = sshkey_verify(key, signature, signaturelen, data, datalen,
1.176 djm 1195: sigalg, active_state->compat);
1.172 djm 1196: debug3("%s: %s %p signature %s", __func__, auth_method, key,
1197: (ret == 0) ? "verified" : "unverified");
1198: auth2_record_key(authctxt, ret == 0, key);
1.136 djm 1199:
1.124 djm 1200: free(blob);
1201: free(signature);
1202: free(data);
1.177 djm 1203: free(sigalg);
1.1 provos 1204:
1.180 djm 1205: if (key_blobtype == MM_USERKEY)
1206: auth_activate_options(ssh, key_opts);
1.1 provos 1207: monitor_reset_key_state();
1.3 markus 1208:
1.172 djm 1209: sshkey_free(key);
1.169 markus 1210: sshbuf_reset(m);
1211:
1212: /* encode ret != 0 as positive integer, since we're sending u32 */
1213: encoded_ret = (ret != 0);
1214: if ((r = sshbuf_put_u32(m, encoded_ret)) != 0)
1215: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.59 avsm 1216: mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
1.1 provos 1217:
1.169 markus 1218: return ret == 0;
1.1 provos 1219: }
1220:
1.2 markus 1221: static void
1.1 provos 1222: mm_record_login(Session *s, struct passwd *pw)
1223: {
1.158 djm 1224: struct ssh *ssh = active_state; /* XXX */
1.1 provos 1225: socklen_t fromlen;
1226: struct sockaddr_storage from;
1227:
1228: /*
1229: * Get IP address of client. If the connection is not a socket, let
1230: * the address be 0.0.0.0.
1231: */
1232: memset(&from, 0, sizeof(from));
1.24 stevesk 1233: fromlen = sizeof(from);
1.1 provos 1234: if (packet_connection_is_on_socket()) {
1235: if (getpeername(packet_get_connection_in(),
1.74 deraadt 1236: (struct sockaddr *)&from, &fromlen) < 0) {
1.1 provos 1237: debug("getpeername: %.100s", strerror(errno));
1.50 markus 1238: cleanup_exit(255);
1.1 provos 1239: }
1240: }
1241: /* Record that there was a login on that tty from the remote host. */
1242: record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1.158 djm 1243: session_get_remote_name_or_ip(ssh, utmp_len, options.use_dns),
1.24 stevesk 1244: (struct sockaddr *)&from, fromlen);
1.1 provos 1245: }
1246:
1247: static void
1248: mm_session_close(Session *s)
1249: {
1.41 djm 1250: debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
1.1 provos 1251: if (s->ttyfd != -1) {
1.86 stevesk 1252: debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1.1 provos 1253: session_pty_cleanup2(s);
1254: }
1.96 djm 1255: session_unused(s->self);
1.1 provos 1256: }
1257:
1258: int
1.183 markus 1259: mm_answer_pty(int sock, struct sshbuf *m)
1.1 provos 1260: {
1.11 mouring 1261: extern struct monitor *pmonitor;
1.1 provos 1262: Session *s;
1.183 markus 1263: int r, res, fd0;
1.1 provos 1264:
1.14 markus 1265: debug3("%s entering", __func__);
1.1 provos 1266:
1.183 markus 1267: sshbuf_reset(m);
1.1 provos 1268: s = session_new();
1269: if (s == NULL)
1270: goto error;
1271: s->authctxt = authctxt;
1272: s->pw = authctxt->pw;
1.11 mouring 1273: s->pid = pmonitor->m_pid;
1.1 provos 1274: res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1275: if (res == 0)
1276: goto error;
1277: pty_setowner(authctxt->pw, s->tty);
1278:
1.183 markus 1279: if ((r = sshbuf_put_u32(m, 1)) != 0 ||
1280: (r = sshbuf_put_cstring(m, s->tty)) != 0)
1281: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 1282:
1283: /* We need to trick ttyslot */
1284: if (dup2(s->ttyfd, 0) == -1)
1.14 markus 1285: fatal("%s: dup2", __func__);
1.1 provos 1286:
1287: mm_record_login(s, authctxt->pw);
1288:
1289: /* Now we can close the file descriptor again */
1290: close(0);
1.61 dtucker 1291:
1292: /* send messages generated by record_login */
1.183 markus 1293: if ((r = sshbuf_put_stringb(m, loginmsg)) != 0)
1294: fatal("%s: put login message: %s", __func__, ssh_err(r));
1295: sshbuf_reset(loginmsg);
1.61 dtucker 1296:
1297: mm_request_send(sock, MONITOR_ANS_PTY, m);
1298:
1.92 djm 1299: if (mm_send_fd(sock, s->ptyfd) == -1 ||
1300: mm_send_fd(sock, s->ttyfd) == -1)
1301: fatal("%s: send fds failed", __func__);
1.1 provos 1302:
1303: /* make sure nothing uses fd 0 */
1304: if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1.14 markus 1305: fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
1.1 provos 1306: if (fd0 != 0)
1.14 markus 1307: error("%s: fd0 %d != 0", __func__, fd0);
1.1 provos 1308:
1309: /* slave is not needed */
1310: close(s->ttyfd);
1311: s->ttyfd = s->ptyfd;
1312: /* no need to dup() because nobody closes ptyfd */
1313: s->ptymaster = s->ptyfd;
1314:
1.86 stevesk 1315: debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
1.1 provos 1316:
1317: return (0);
1318:
1319: error:
1320: if (s != NULL)
1321: mm_session_close(s);
1.183 markus 1322: if ((r = sshbuf_put_u32(m, 0)) != 0)
1323: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.59 avsm 1324: mm_request_send(sock, MONITOR_ANS_PTY, m);
1.1 provos 1325: return (0);
1326: }
1327:
1328: int
1.183 markus 1329: mm_answer_pty_cleanup(int sock, struct sshbuf *m)
1.1 provos 1330: {
1331: Session *s;
1332: char *tty;
1.183 markus 1333: int r;
1.1 provos 1334:
1.14 markus 1335: debug3("%s entering", __func__);
1.1 provos 1336:
1.183 markus 1337: if ((r = sshbuf_get_cstring(m, &tty, NULL)) != 0)
1338: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 1339: if ((s = session_by_tty(tty)) != NULL)
1340: mm_session_close(s);
1.183 markus 1341: sshbuf_reset(m);
1.124 djm 1342: free(tty);
1.1 provos 1343: return (0);
1344: }
1345:
1346: int
1.183 markus 1347: mm_answer_term(int sock, struct sshbuf *req)
1.1 provos 1348: {
1.173 djm 1349: struct ssh *ssh = active_state; /* XXX */
1.11 mouring 1350: extern struct monitor *pmonitor;
1.1 provos 1351: int res, status;
1352:
1.14 markus 1353: debug3("%s: tearing down sessions", __func__);
1.1 provos 1354:
1355: /* The child is terminating */
1.173 djm 1356: session_destroy_all(ssh, &mm_session_close);
1.1 provos 1357:
1.11 mouring 1358: while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1.9 markus 1359: if (errno != EINTR)
1360: exit(1);
1.1 provos 1361:
1362: res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1363:
1364: /* Terminate process */
1.57 deraadt 1365: exit(res);
1.170 markus 1366: }
1367:
1368: void
1369: monitor_clear_keystate(struct monitor *pmonitor)
1370: {
1371: struct ssh *ssh = active_state; /* XXX */
1372:
1373: ssh_clear_newkeys(ssh, MODE_IN);
1374: ssh_clear_newkeys(ssh, MODE_OUT);
1375: sshbuf_free(child_state);
1376: child_state = NULL;
1.1 provos 1377: }
1378:
1379: void
1.11 mouring 1380: monitor_apply_keystate(struct monitor *pmonitor)
1.1 provos 1381: {
1.139 markus 1382: struct ssh *ssh = active_state; /* XXX */
1383: struct kex *kex;
1384: int r;
1385:
1386: debug3("%s: packet_set_state", __func__);
1387: if ((r = ssh_packet_set_state(ssh, child_state)) != 0)
1388: fatal("%s: packet_set_state: %s", __func__, ssh_err(r));
1389: sshbuf_free(child_state);
1390: child_state = NULL;
1391:
1.154 mmcc 1392: if ((kex = ssh->kex) != NULL) {
1.139 markus 1393: /* XXX set callbacks */
1.147 djm 1394: #ifdef WITH_OPENSSL
1.139 markus 1395: kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1396: kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
1.160 djm 1397: kex->kex[KEX_DH_GRP14_SHA256] = kexdh_server;
1398: kex->kex[KEX_DH_GRP16_SHA512] = kexdh_server;
1399: kex->kex[KEX_DH_GRP18_SHA512] = kexdh_server;
1.139 markus 1400: kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
1401: kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
1402: kex->kex[KEX_ECDH_SHA2] = kexecdh_server;
1.147 djm 1403: #endif
1.139 markus 1404: kex->kex[KEX_C25519_SHA256] = kexc25519_server;
1405: kex->load_host_public_key=&get_hostkey_public_by_type;
1406: kex->load_host_private_key=&get_hostkey_private_by_type;
1407: kex->host_key_index=&get_hostkey_index;
1408: kex->sign = sshd_hostkey_sign;
1409: }
1.1 provos 1410: }
1411:
1412: /* This function requries careful sanity checking */
1413:
1414: void
1.11 mouring 1415: mm_get_keystate(struct monitor *pmonitor)
1.1 provos 1416: {
1.14 markus 1417: debug3("%s: Waiting for new keys", __func__);
1.1 provos 1418:
1.139 markus 1419: if ((child_state = sshbuf_new()) == NULL)
1420: fatal("%s: sshbuf_new failed", __func__);
1421: mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT,
1422: child_state);
1423: debug3("%s: GOT new keys", __func__);
1.1 provos 1424: }
1425:
1426:
1427: /* XXX */
1428:
1429: #define FD_CLOSEONEXEC(x) do { \
1.111 djm 1430: if (fcntl(x, F_SETFD, FD_CLOEXEC) == -1) \
1.1 provos 1431: fatal("fcntl(%d, F_SETFD)", x); \
1432: } while (0)
1433:
1.2 markus 1434: static void
1.114 djm 1435: monitor_openfds(struct monitor *mon, int do_logfds)
1.3 markus 1436: {
1.114 djm 1437: int pair[2];
1.171 markus 1438: #ifdef SO_ZEROIZE
1439: int on = 1;
1440: #endif
1.114 djm 1441:
1.1 provos 1442: if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1.114 djm 1443: fatal("%s: socketpair: %s", __func__, strerror(errno));
1.171 markus 1444: #ifdef SO_ZEROIZE
1445: if (setsockopt(pair[0], SOL_SOCKET, SO_ZEROIZE, &on, sizeof(on)) < 0)
1446: error("setsockopt SO_ZEROIZE(0): %.100s", strerror(errno));
1447: if (setsockopt(pair[1], SOL_SOCKET, SO_ZEROIZE, &on, sizeof(on)) < 0)
1448: error("setsockopt SO_ZEROIZE(1): %.100s", strerror(errno));
1449: #endif
1.1 provos 1450: FD_CLOSEONEXEC(pair[0]);
1451: FD_CLOSEONEXEC(pair[1]);
1.114 djm 1452: mon->m_recvfd = pair[0];
1453: mon->m_sendfd = pair[1];
1454:
1455: if (do_logfds) {
1456: if (pipe(pair) == -1)
1457: fatal("%s: pipe: %s", __func__, strerror(errno));
1458: FD_CLOSEONEXEC(pair[0]);
1459: FD_CLOSEONEXEC(pair[1]);
1460: mon->m_log_recvfd = pair[0];
1461: mon->m_log_sendfd = pair[1];
1462: } else
1463: mon->m_log_recvfd = mon->m_log_sendfd = -1;
1.1 provos 1464: }
1465:
1466: #define MM_MEMSIZE 65536
1467:
1468: struct monitor *
1469: monitor_init(void)
1470: {
1471: struct monitor *mon;
1472:
1.75 djm 1473: mon = xcalloc(1, sizeof(*mon));
1.114 djm 1474: monitor_openfds(mon, 1);
1.1 provos 1475:
1476: return mon;
1477: }
1478:
1479: void
1480: monitor_reinit(struct monitor *mon)
1481: {
1.114 djm 1482: monitor_openfds(mon, 0);
1.1 provos 1483: }
1.46 markus 1484:
1485: #ifdef GSSAPI
1486: int
1.183 markus 1487: mm_answer_gss_setup_ctx(int sock, struct sshbuf *m)
1.46 markus 1488: {
1.59 avsm 1489: gss_OID_desc goid;
1.46 markus 1490: OM_uint32 major;
1.183 markus 1491: size_t len;
1.184 djm 1492: u_char *p;
1.183 markus 1493: int r;
1.46 markus 1494:
1.164 djm 1495: if (!options.gss_authentication)
1496: fatal("%s: GSSAPI authentication not enabled", __func__);
1497:
1.184 djm 1498: if ((r = sshbuf_get_string(m, &p, &len)) != 0)
1.183 markus 1499: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.184 djm 1500: goid.elements = p;
1.59 avsm 1501: goid.length = len;
1.46 markus 1502:
1.59 avsm 1503: major = ssh_gssapi_server_ctx(&gsscontext, &goid);
1.46 markus 1504:
1.124 djm 1505: free(goid.elements);
1.46 markus 1506:
1.183 markus 1507: sshbuf_reset(m);
1508: if ((r = sshbuf_put_u32(m, major)) != 0)
1509: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.46 markus 1510:
1.64 stevesk 1511: mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
1.46 markus 1512:
1513: /* Now we have a context, enable the step */
1514: monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1515:
1516: return (0);
1517: }
1518:
1519: int
1.183 markus 1520: mm_answer_gss_accept_ctx(int sock, struct sshbuf *m)
1.46 markus 1521: {
1522: gss_buffer_desc in;
1523: gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
1.64 stevesk 1524: OM_uint32 major, minor;
1.46 markus 1525: OM_uint32 flags = 0; /* GSI needs this */
1.183 markus 1526: int r;
1.46 markus 1527:
1.164 djm 1528: if (!options.gss_authentication)
1529: fatal("%s: GSSAPI authentication not enabled", __func__);
1530:
1.184 djm 1531: if ((r = ssh_gssapi_get_buffer_desc(m, &in)) != 0)
1.183 markus 1532: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.46 markus 1533: major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1.124 djm 1534: free(in.value);
1.46 markus 1535:
1.183 markus 1536: sshbuf_reset(m);
1537: if ((r = sshbuf_put_u32(m, major)) != 0 ||
1538: (r = sshbuf_put_string(m, out.value, out.length)) != 0 ||
1539: (r = sshbuf_put_u32(m, flags)) != 0)
1540: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.59 avsm 1541: mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
1.46 markus 1542:
1543: gss_release_buffer(&minor, &out);
1544:
1.64 stevesk 1545: if (major == GSS_S_COMPLETE) {
1.46 markus 1546: monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
1547: monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1.52 markus 1548: monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
1.46 markus 1549: }
1550: return (0);
1551: }
1552:
1553: int
1.183 markus 1554: mm_answer_gss_checkmic(int sock, struct sshbuf *m)
1.52 markus 1555: {
1556: gss_buffer_desc gssbuf, mic;
1557: OM_uint32 ret;
1.184 djm 1558: int r;
1.54 djm 1559:
1.164 djm 1560: if (!options.gss_authentication)
1561: fatal("%s: GSSAPI authentication not enabled", __func__);
1562:
1.184 djm 1563: if ((r = ssh_gssapi_get_buffer_desc(m, &gssbuf)) != 0 ||
1564: (r = ssh_gssapi_get_buffer_desc(m, &mic)) != 0)
1.183 markus 1565: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.54 djm 1566:
1.52 markus 1567: ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
1.54 djm 1568:
1.124 djm 1569: free(gssbuf.value);
1570: free(mic.value);
1.54 djm 1571:
1.183 markus 1572: sshbuf_reset(m);
1573: if ((r = sshbuf_put_u32(m, ret)) != 0)
1574: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.54 djm 1575:
1.59 avsm 1576: mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
1.54 djm 1577:
1.52 markus 1578: if (!GSS_ERROR(ret))
1579: monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1.54 djm 1580:
1.52 markus 1581: return (0);
1582: }
1583:
1584: int
1.183 markus 1585: mm_answer_gss_userok(int sock, struct sshbuf *m)
1.46 markus 1586: {
1.184 djm 1587: int r, authenticated;
1.172 djm 1588: const char *displayname;
1.164 djm 1589:
1590: if (!options.gss_authentication)
1591: fatal("%s: GSSAPI authentication not enabled", __func__);
1.46 markus 1592:
1593: authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1594:
1.183 markus 1595: sshbuf_reset(m);
1596: if ((r = sshbuf_put_u32(m, authenticated)) != 0)
1597: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.46 markus 1598:
1599: debug3("%s: sending result %d", __func__, authenticated);
1.59 avsm 1600: mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
1.46 markus 1601:
1.64 stevesk 1602: auth_method = "gssapi-with-mic";
1.172 djm 1603:
1604: if ((displayname = ssh_gssapi_displayname()) != NULL)
1605: auth2_record_info(authctxt, "%s", displayname);
1.46 markus 1606:
1607: /* Monitor loop will terminate if authenticated */
1608: return (authenticated);
1609: }
1610: #endif /* GSSAPI */
1.100 djm 1611:
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