Annotation of src/usr.bin/ssh/monitor.c, Revision 1.185
1.185 ! markus 1: /* $OpenBSD: monitor.c,v 1.184 2018/07/10 09:13:30 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>
1.1 provos 50:
1.114 djm 51: #include "atomicio.h"
1.85 deraadt 52: #include "xmalloc.h"
1.1 provos 53: #include "ssh.h"
1.185 ! markus 54: #include "sshkey.h"
1.183 markus 55: #include "sshbuf.h"
1.85 deraadt 56: #include "hostfile.h"
1.1 provos 57: #include "auth.h"
1.85 deraadt 58: #include "cipher.h"
1.1 provos 59: #include "kex.h"
60: #include "dh.h"
1.88 miod 61: #include <zlib.h>
1.1 provos 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"
1.1 provos 83:
1.46 markus 84: #ifdef GSSAPI
85: static Gssctxt *gsscontext = NULL;
86: #endif
87:
1.1 provos 88: /* Imports */
89: extern ServerOptions options;
90: extern u_int utmp_len;
91: extern u_char session_id[];
1.181 markus 92: extern struct sshbuf *loginmsg;
1.180 djm 93: extern struct sshauthopt *auth_opts; /* XXX move to permanent ssh->authctxt? */
1.1 provos 94:
95: /* State exported from the child */
1.139 markus 96: static struct sshbuf *child_state;
1.1 provos 97:
1.43 markus 98: /* Functions on the monitor that answer unprivileged requests */
1.1 provos 99:
1.183 markus 100: int mm_answer_moduli(int, struct sshbuf *);
101: int mm_answer_sign(int, struct sshbuf *);
102: int mm_answer_pwnamallow(int, struct sshbuf *);
103: int mm_answer_auth2_read_banner(int, struct sshbuf *);
104: int mm_answer_authserv(int, struct sshbuf *);
105: int mm_answer_authpassword(int, struct sshbuf *);
106: int mm_answer_bsdauthquery(int, struct sshbuf *);
107: int mm_answer_bsdauthrespond(int, struct sshbuf *);
108: int mm_answer_skeyquery(int, struct sshbuf *);
109: int mm_answer_skeyrespond(int, struct sshbuf *);
110: int mm_answer_keyallowed(int, struct sshbuf *);
111: int mm_answer_keyverify(int, struct sshbuf *);
112: int mm_answer_pty(int, struct sshbuf *);
113: int mm_answer_pty_cleanup(int, struct sshbuf *);
114: int mm_answer_term(int, struct sshbuf *);
115: int mm_answer_rsa_keyallowed(int, struct sshbuf *);
116: int mm_answer_rsa_challenge(int, struct sshbuf *);
117: int mm_answer_rsa_response(int, struct sshbuf *);
118: int mm_answer_sesskey(int, struct sshbuf *);
119: int mm_answer_sessid(int, struct sshbuf *);
1.1 provos 120:
1.46 markus 121: #ifdef GSSAPI
1.183 markus 122: int mm_answer_gss_setup_ctx(int, struct sshbuf *);
123: int mm_answer_gss_accept_ctx(int, struct sshbuf *);
124: int mm_answer_gss_userok(int, struct sshbuf *);
125: int mm_answer_gss_checkmic(int, struct sshbuf *);
1.46 markus 126: #endif
1.25 itojun 127:
1.114 djm 128: static int monitor_read_log(struct monitor *);
129:
1.1 provos 130: static Authctxt *authctxt;
1.132 markus 131:
1.1 provos 132: /* local state for key verify */
133: static u_char *key_blob = NULL;
1.183 markus 134: static size_t key_bloblen = 0;
1.1 provos 135: static int key_blobtype = MM_NOKEY;
1.180 djm 136: static struct sshauthopt *key_opts = NULL;
1.26 markus 137: static char *hostbased_cuser = NULL;
138: static char *hostbased_chost = NULL;
1.1 provos 139: static char *auth_method = "unknown";
1.119 djm 140: static char *auth_submethod = NULL;
1.44 markus 141: static u_int session_id2_len = 0;
1.13 markus 142: static u_char *session_id2 = NULL;
1.40 markus 143: static pid_t monitor_child_pid;
1.1 provos 144:
145: struct mon_table {
146: enum monitor_reqtype type;
147: int flags;
1.183 markus 148: int (*f)(int, struct sshbuf *);
1.1 provos 149: };
150:
151: #define MON_ISAUTH 0x0004 /* Required for Authentication */
152: #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
153: #define MON_ONCE 0x0010 /* Disable after calling */
1.77 dtucker 154: #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */
1.1 provos 155:
156: #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
157:
158: #define MON_PERMIT 0x1000 /* Request is permitted */
159:
160: struct mon_table mon_dispatch_proto20[] = {
1.132 markus 161: #ifdef WITH_OPENSSL
1.1 provos 162: {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
1.132 markus 163: #endif
1.1 provos 164: {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
165: {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
166: {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
1.10 djm 167: {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
1.1 provos 168: {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
169: {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
1.66 stevesk 170: {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
1.1 provos 171: {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
172: {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
1.46 markus 173: #ifdef GSSAPI
174: {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
1.165 djm 175: {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
176: {MONITOR_REQ_GSSUSEROK, MON_ONCE|MON_AUTHDECIDE, mm_answer_gss_userok},
177: {MONITOR_REQ_GSSCHECKMIC, MON_ONCE, mm_answer_gss_checkmic},
1.46 markus 178: #endif
1.1 provos 179: {0, 0, NULL}
180: };
181:
182: struct mon_table mon_dispatch_postauth20[] = {
1.132 markus 183: #ifdef WITH_OPENSSL
1.1 provos 184: {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
1.132 markus 185: #endif
1.1 provos 186: {MONITOR_REQ_SIGN, 0, mm_answer_sign},
187: {MONITOR_REQ_PTY, 0, mm_answer_pty},
188: {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
189: {MONITOR_REQ_TERM, 0, mm_answer_term},
190: {0, 0, NULL}
191: };
192:
193: struct mon_table *mon_dispatch;
194:
195: /* Specifies if a certain message is allowed at the moment */
196: static void
197: monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
198: {
199: while (ent->f != NULL) {
200: if (ent->type == type) {
201: ent->flags &= ~MON_PERMIT;
202: ent->flags |= permit ? MON_PERMIT : 0;
203: return;
204: }
205: ent++;
206: }
207: }
208:
209: static void
210: monitor_permit_authentications(int permit)
211: {
212: struct mon_table *ent = mon_dispatch;
213:
214: while (ent->f != NULL) {
215: if (ent->flags & MON_AUTH) {
216: ent->flags &= ~MON_PERMIT;
217: ent->flags |= permit ? MON_PERMIT : 0;
218: }
219: ent++;
220: }
221: }
222:
1.50 markus 223: void
224: monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
1.1 provos 225: {
1.167 djm 226: struct ssh *ssh = active_state; /* XXX */
1.1 provos 227: struct mon_table *ent;
1.119 djm 228: int authenticated = 0, partial = 0;
1.1 provos 229:
230: debug3("preauth child monitor started");
231:
1.179 tb 232: if (pmonitor->m_recvfd >= 0)
233: close(pmonitor->m_recvfd);
234: if (pmonitor->m_log_sendfd >= 0)
235: close(pmonitor->m_log_sendfd);
1.114 djm 236: pmonitor->m_log_sendfd = pmonitor->m_recvfd = -1;
237:
1.50 markus 238: authctxt = _authctxt;
239: memset(authctxt, 0, sizeof(*authctxt));
1.180 djm 240: ssh->authctxt = authctxt;
1.50 markus 241:
1.162 markus 242: mon_dispatch = mon_dispatch_proto20;
243: /* Permit requests for moduli and signatures */
244: monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
245: monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
1.1 provos 246:
247: /* The first few requests do not require asynchronous access */
248: while (!authenticated) {
1.119 djm 249: partial = 0;
1.77 dtucker 250: auth_method = "unknown";
1.119 djm 251: auth_submethod = NULL;
1.172 djm 252: auth2_authctxt_reset_info(authctxt);
253:
1.89 markus 254: authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1);
1.118 djm 255:
256: /* Special handling for multiple required authentications */
257: if (options.num_auth_methods != 0) {
258: if (authenticated &&
259: !auth2_update_methods_lists(authctxt,
1.122 markus 260: auth_method, auth_submethod)) {
1.118 djm 261: debug3("%s: method %s: partial", __func__,
262: auth_method);
263: authenticated = 0;
1.119 djm 264: partial = 1;
1.118 djm 265: }
266: }
267:
1.1 provos 268: if (authenticated) {
269: if (!(ent->flags & MON_AUTHDECIDE))
270: fatal("%s: unexpected authentication from %d",
1.14 markus 271: __func__, ent->type);
1.1 provos 272: if (authctxt->pw->pw_uid == 0 &&
1.180 djm 273: !auth_root_allowed(ssh, auth_method))
1.1 provos 274: authenticated = 0;
275: }
1.77 dtucker 276: if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) {
1.119 djm 277: auth_log(authctxt, authenticated, partial,
1.125 djm 278: auth_method, auth_submethod);
1.150 djm 279: if (!partial && !authenticated)
1.1 provos 280: authctxt->failures++;
1.172 djm 281: if (authenticated || partial) {
282: auth2_update_session_info(authctxt,
283: auth_method, auth_submethod);
284: }
1.1 provos 285: }
286: }
287:
288: if (!authctxt->valid)
1.14 markus 289: fatal("%s: authenticated invalid user", __func__);
1.77 dtucker 290: if (strcmp(auth_method, "unknown") == 0)
291: fatal("%s: authentication method name unknown", __func__);
1.1 provos 292:
293: debug("%s: %s has been authenticated by privileged process",
1.14 markus 294: __func__, authctxt->user);
1.180 djm 295: ssh->authctxt = NULL;
1.167 djm 296: ssh_packet_set_log_preamble(ssh, "user %s", authctxt->user);
1.1 provos 297:
1.11 mouring 298: mm_get_keystate(pmonitor);
1.120 markus 299:
300: /* Drain any buffered messages from the child */
301: while (pmonitor->m_log_recvfd != -1 && monitor_read_log(pmonitor) == 0)
302: ;
1.114 djm 303:
1.179 tb 304: if (pmonitor->m_recvfd >= 0)
305: close(pmonitor->m_recvfd);
306: if (pmonitor->m_log_sendfd >= 0)
307: close(pmonitor->m_log_sendfd);
1.114 djm 308: pmonitor->m_sendfd = pmonitor->m_log_recvfd = -1;
1.1 provos 309: }
310:
1.40 markus 311: static void
312: monitor_set_child_handler(pid_t pid)
313: {
314: monitor_child_pid = pid;
315: }
316:
317: static void
1.59 avsm 318: monitor_child_handler(int sig)
1.40 markus 319: {
1.59 avsm 320: kill(monitor_child_pid, sig);
1.40 markus 321: }
322:
1.1 provos 323: void
1.11 mouring 324: monitor_child_postauth(struct monitor *pmonitor)
1.1 provos 325: {
1.114 djm 326: close(pmonitor->m_recvfd);
327: pmonitor->m_recvfd = -1;
328:
1.40 markus 329: monitor_set_child_handler(pmonitor->m_pid);
330: signal(SIGHUP, &monitor_child_handler);
331: signal(SIGTERM, &monitor_child_handler);
1.91 djm 332: signal(SIGINT, &monitor_child_handler);
1.40 markus 333:
1.162 markus 334: mon_dispatch = mon_dispatch_postauth20;
335:
336: /* Permit requests for moduli and signatures */
337: monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
338: monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
339: monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
1.1 provos 340:
1.180 djm 341: if (auth_opts->permit_pty_flag) {
1.1 provos 342: monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
343: monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
344: }
345:
346: for (;;)
1.11 mouring 347: monitor_read(pmonitor, mon_dispatch, NULL);
1.1 provos 348: }
349:
1.114 djm 350: static int
351: monitor_read_log(struct monitor *pmonitor)
352: {
1.183 markus 353: struct sshbuf *logmsg;
1.114 djm 354: u_int len, level;
355: char *msg;
1.183 markus 356: u_char *p;
357: int r;
1.114 djm 358:
1.183 markus 359: if ((logmsg = sshbuf_new()) == NULL)
360: fatal("%s: sshbuf_new", __func__);
1.114 djm 361:
362: /* Read length */
1.183 markus 363: if ((r = sshbuf_reserve(logmsg, 4, &p)) != 0)
364: fatal("%s: reserve: %s", __func__, ssh_err(r));
365: if (atomicio(read, pmonitor->m_log_recvfd, p, 4) != 4) {
1.114 djm 366: if (errno == EPIPE) {
1.183 markus 367: sshbuf_free(logmsg);
1.114 djm 368: debug("%s: child log fd closed", __func__);
369: close(pmonitor->m_log_recvfd);
370: pmonitor->m_log_recvfd = -1;
371: return -1;
372: }
373: fatal("%s: log fd read: %s", __func__, strerror(errno));
374: }
1.183 markus 375: if ((r = sshbuf_get_u32(logmsg, &len)) != 0)
376: fatal("%s: get len: %s", __func__, ssh_err(r));
1.114 djm 377: if (len <= 4 || len > 8192)
378: fatal("%s: invalid log message length %u", __func__, len);
379:
380: /* Read severity, message */
1.183 markus 381: sshbuf_reset(logmsg);
382: if ((r = sshbuf_reserve(logmsg, len, &p)) != 0)
383: fatal("%s: reserve: %s", __func__, ssh_err(r));
384: if (atomicio(read, pmonitor->m_log_recvfd, p, len) != len)
1.114 djm 385: fatal("%s: log fd read: %s", __func__, strerror(errno));
1.183 markus 386: if ((r = sshbuf_get_u32(logmsg, &level)) != 0 ||
387: (r = sshbuf_get_cstring(logmsg, &msg, NULL)) != 0)
388: fatal("%s: decode: %s", __func__, ssh_err(r));
1.114 djm 389:
390: /* Log it */
391: if (log_level_name(level) == NULL)
392: fatal("%s: invalid log level %u (corrupted message?)",
393: __func__, level);
394: do_log2(level, "%s [preauth]", msg);
395:
1.183 markus 396: sshbuf_free(logmsg);
1.124 djm 397: free(msg);
1.114 djm 398:
399: return 0;
400: }
401:
1.1 provos 402: int
1.11 mouring 403: monitor_read(struct monitor *pmonitor, struct mon_table *ent,
1.1 provos 404: struct mon_table **pent)
405: {
1.183 markus 406: struct sshbuf *m;
407: int r, ret;
1.1 provos 408: u_char type;
1.114 djm 409: struct pollfd pfd[2];
410:
411: for (;;) {
1.130 tedu 412: memset(&pfd, 0, sizeof(pfd));
1.114 djm 413: pfd[0].fd = pmonitor->m_sendfd;
414: pfd[0].events = POLLIN;
415: pfd[1].fd = pmonitor->m_log_recvfd;
416: pfd[1].events = pfd[1].fd == -1 ? 0 : POLLIN;
1.115 djm 417: if (poll(pfd, pfd[1].fd == -1 ? 1 : 2, -1) == -1) {
418: if (errno == EINTR || errno == EAGAIN)
419: continue;
1.114 djm 420: fatal("%s: poll: %s", __func__, strerror(errno));
1.115 djm 421: }
1.114 djm 422: if (pfd[1].revents) {
423: /*
424: * Drain all log messages before processing next
425: * monitor request.
426: */
427: monitor_read_log(pmonitor);
428: continue;
429: }
430: if (pfd[0].revents)
431: break; /* Continues below */
432: }
1.1 provos 433:
1.183 markus 434: if ((m = sshbuf_new()) == NULL)
435: fatal("%s: sshbuf_new", __func__);
1.1 provos 436:
1.183 markus 437: mm_request_receive(pmonitor->m_sendfd, m);
438: if ((r = sshbuf_get_u8(m, &type)) != 0)
439: fatal("%s: decode: %s", __func__, ssh_err(r));
1.1 provos 440:
1.14 markus 441: debug3("%s: checking request %d", __func__, type);
1.1 provos 442:
443: while (ent->f != NULL) {
444: if (ent->type == type)
445: break;
446: ent++;
447: }
448:
449: if (ent->f != NULL) {
450: if (!(ent->flags & MON_PERMIT))
1.14 markus 451: fatal("%s: unpermitted request %d", __func__,
1.1 provos 452: type);
1.183 markus 453: ret = (*ent->f)(pmonitor->m_sendfd, m);
454: sshbuf_free(m);
1.1 provos 455:
456: /* The child may use this request only once, disable it */
457: if (ent->flags & MON_ONCE) {
1.14 markus 458: debug2("%s: %d used once, disabling now", __func__,
1.1 provos 459: type);
460: ent->flags &= ~MON_PERMIT;
461: }
462:
463: if (pent != NULL)
464: *pent = ent;
1.3 markus 465:
1.1 provos 466: return ret;
467: }
468:
1.14 markus 469: fatal("%s: unsupported request: %d", __func__, type);
1.1 provos 470:
471: /* NOTREACHED */
472: return (-1);
473: }
474:
475: /* allowed key state */
476: static int
477: monitor_allowed_key(u_char *blob, u_int bloblen)
478: {
479: /* make sure key is allowed */
480: if (key_blob == NULL || key_bloblen != bloblen ||
1.108 djm 481: timingsafe_bcmp(key_blob, blob, key_bloblen))
1.1 provos 482: return (0);
483: return (1);
484: }
485:
486: static void
487: monitor_reset_key_state(void)
488: {
489: /* reset state */
1.124 djm 490: free(key_blob);
491: free(hostbased_cuser);
492: free(hostbased_chost);
1.180 djm 493: sshauthopt_free(key_opts);
1.1 provos 494: key_blob = NULL;
495: key_bloblen = 0;
496: key_blobtype = MM_NOKEY;
1.180 djm 497: key_opts = NULL;
1.1 provos 498: hostbased_cuser = NULL;
499: hostbased_chost = NULL;
500: }
501:
1.132 markus 502: #ifdef WITH_OPENSSL
1.1 provos 503: int
1.183 markus 504: mm_answer_moduli(int sock, struct sshbuf *m)
1.1 provos 505: {
506: DH *dh;
1.183 markus 507: int r;
508: u_int min, want, max;
1.1 provos 509:
1.183 markus 510: if ((r = sshbuf_get_u32(m, &min)) != 0 ||
511: (r = sshbuf_get_u32(m, &want)) != 0 ||
512: (r = sshbuf_get_u32(m, &max)) != 0)
513: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 514:
515: debug3("%s: got parameters: %d %d %d",
1.14 markus 516: __func__, min, want, max);
1.1 provos 517: /* We need to check here, too, in case the child got corrupted */
518: if (max < min || want < min || max < want)
519: fatal("%s: bad parameters: %d %d %d",
1.14 markus 520: __func__, min, want, max);
1.1 provos 521:
1.183 markus 522: sshbuf_reset(m);
1.1 provos 523:
524: dh = choose_dh(min, want, max);
525: if (dh == NULL) {
1.183 markus 526: if ((r = sshbuf_put_u8(m, 0)) != 0)
527: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 528: return (0);
529: } else {
530: /* Send first bignum */
1.183 markus 531: if ((r = sshbuf_put_u8(m, 1)) != 0 ||
532: (r = sshbuf_put_bignum2(m, dh->p)) != 0 ||
533: (r = sshbuf_put_bignum2(m, dh->g)) != 0)
534: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.3 markus 535:
1.1 provos 536: DH_free(dh);
537: }
1.59 avsm 538: mm_request_send(sock, MONITOR_ANS_MODULI, m);
1.1 provos 539: return (0);
540: }
1.132 markus 541: #endif
1.1 provos 542:
543: int
1.183 markus 544: mm_answer_sign(int sock, struct sshbuf *m)
1.1 provos 545: {
1.144 djm 546: struct ssh *ssh = active_state; /* XXX */
1.138 djm 547: extern int auth_sock; /* XXX move to state struct? */
548: struct sshkey *key;
1.157 djm 549: struct sshbuf *sigbuf = NULL;
550: u_char *p = NULL, *signature = NULL;
551: char *alg = NULL;
1.155 markus 552: size_t datlen, siglen, alglen;
1.159 djm 553: int r, is_proof = 0;
1.185 ! markus 554: u_int keyid, compat;
1.145 djm 555: const char proof_req[] = "hostkeys-prove-00@openssh.com";
1.3 markus 556:
1.14 markus 557: debug3("%s", __func__);
1.1 provos 558:
1.138 djm 559: if ((r = sshbuf_get_u32(m, &keyid)) != 0 ||
1.155 markus 560: (r = sshbuf_get_string(m, &p, &datlen)) != 0 ||
1.185 ! markus 561: (r = sshbuf_get_cstring(m, &alg, &alglen)) != 0 ||
! 562: (r = sshbuf_get_u32(m, &compat)) != 0)
1.138 djm 563: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.159 djm 564: if (keyid > INT_MAX)
565: fatal("%s: invalid key ID", __func__);
1.1 provos 566:
1.69 djm 567: /*
1.110 djm 568: * Supported KEX types use SHA1 (20 bytes), SHA256 (32 bytes),
569: * SHA384 (48 bytes) and SHA512 (64 bytes).
1.144 djm 570: *
571: * Otherwise, verify the signature request is for a hostkey
572: * proof.
573: *
574: * XXX perform similar check for KEX signature requests too?
575: * it's not trivial, since what is signed is the hash, rather
576: * than the full kex structure...
1.69 djm 577: */
1.144 djm 578: if (datlen != 20 && datlen != 32 && datlen != 48 && datlen != 64) {
579: /*
580: * Construct expected hostkey proof and compare it to what
581: * the client sent us.
582: */
583: if (session_id2_len == 0) /* hostkeys is never first */
584: fatal("%s: bad data length: %zu", __func__, datlen);
585: if ((key = get_hostkey_public_by_index(keyid, ssh)) == NULL)
586: fatal("%s: no hostkey for index %d", __func__, keyid);
587: if ((sigbuf = sshbuf_new()) == NULL)
588: fatal("%s: sshbuf_new", __func__);
1.145 djm 589: if ((r = sshbuf_put_cstring(sigbuf, proof_req)) != 0 ||
590: (r = sshbuf_put_string(sigbuf, session_id2,
1.152 jsg 591: session_id2_len)) != 0 ||
1.144 djm 592: (r = sshkey_puts(key, sigbuf)) != 0)
593: fatal("%s: couldn't prepare private key "
594: "proof buffer: %s", __func__, ssh_err(r));
595: if (datlen != sshbuf_len(sigbuf) ||
596: memcmp(p, sshbuf_ptr(sigbuf), sshbuf_len(sigbuf)) != 0)
597: fatal("%s: bad data length: %zu, hostkey proof len %zu",
598: __func__, datlen, sshbuf_len(sigbuf));
599: sshbuf_free(sigbuf);
600: is_proof = 1;
601: }
1.1 provos 602:
1.13 markus 603: /* save session id, it will be passed on the first call */
604: if (session_id2_len == 0) {
605: session_id2_len = datlen;
606: session_id2 = xmalloc(session_id2_len);
607: memcpy(session_id2, p, session_id2_len);
608: }
609:
1.127 markus 610: if ((key = get_hostkey_by_index(keyid)) != NULL) {
1.155 markus 611: if ((r = sshkey_sign(key, &signature, &siglen, p, datlen, alg,
1.185 ! markus 612: compat)) != 0)
1.138 djm 613: fatal("%s: sshkey_sign failed: %s",
614: __func__, ssh_err(r));
1.144 djm 615: } else if ((key = get_hostkey_public_by_index(keyid, ssh)) != NULL &&
1.138 djm 616: auth_sock > 0) {
617: if ((r = ssh_agent_sign(auth_sock, key, &signature, &siglen,
1.185 ! markus 618: p, datlen, alg, compat)) != 0) {
1.138 djm 619: fatal("%s: ssh_agent_sign failed: %s",
620: __func__, ssh_err(r));
621: }
1.127 markus 622: } else
1.14 markus 623: fatal("%s: no hostkey from index %d", __func__, keyid);
1.1 provos 624:
1.144 djm 625: debug3("%s: %s signature %p(%zu)", __func__,
626: is_proof ? "KEX" : "hostkey proof", signature, siglen);
1.1 provos 627:
1.138 djm 628: sshbuf_reset(m);
629: if ((r = sshbuf_put_string(m, signature, siglen)) != 0)
630: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 631:
1.157 djm 632: free(alg);
1.124 djm 633: free(p);
634: free(signature);
1.1 provos 635:
1.59 avsm 636: mm_request_send(sock, MONITOR_ANS_SIGN, m);
1.1 provos 637:
638: /* Turn on permissions for getpwnam */
639: monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
640:
641: return (0);
642: }
643:
644: /* Retrieves the password entry and also checks if the user is permitted */
645:
646: int
1.183 markus 647: mm_answer_pwnamallow(int sock, struct sshbuf *m)
1.1 provos 648: {
1.167 djm 649: struct ssh *ssh = active_state; /* XXX */
1.60 dtucker 650: char *username;
1.1 provos 651: struct passwd *pwent;
1.183 markus 652: int r, allowed = 0;
1.113 djm 653: u_int i;
1.3 markus 654:
1.14 markus 655: debug3("%s", __func__);
1.1 provos 656:
657: if (authctxt->attempt++ != 0)
1.14 markus 658: fatal("%s: multiple attempts for getpwnam", __func__);
1.1 provos 659:
1.183 markus 660: if ((r = sshbuf_get_cstring(m, &username, NULL)) != 0)
661: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 662:
1.60 dtucker 663: pwent = getpwnamallow(username);
1.1 provos 664:
1.60 dtucker 665: authctxt->user = xstrdup(username);
666: setproctitle("%s [priv]", pwent ? username : "unknown");
1.124 djm 667: free(username);
1.1 provos 668:
1.183 markus 669: sshbuf_reset(m);
1.1 provos 670:
671: if (pwent == NULL) {
1.183 markus 672: if ((r = sshbuf_put_u8(m, 0)) != 0)
673: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.53 djm 674: authctxt->pw = fakepw();
1.1 provos 675: goto out;
676: }
677:
678: allowed = 1;
1.4 markus 679: authctxt->pw = pwent;
1.1 provos 680: authctxt->valid = 1;
681:
1.183 markus 682: /* XXX don't sent pwent to unpriv; send fake class/dir/shell too */
683: if ((r = sshbuf_put_u8(m, 1)) != 0 ||
684: (r = sshbuf_put_string(m, pwent, sizeof(*pwent))) != 0 ||
685: (r = sshbuf_put_cstring(m, pwent->pw_name)) != 0 ||
686: (r = sshbuf_put_cstring(m, "*")) != 0 ||
687: (r = sshbuf_put_cstring(m, pwent->pw_gecos)) != 0 ||
688: (r = sshbuf_put_cstring(m, pwent->pw_class)) != 0 ||
689: (r = sshbuf_put_cstring(m, pwent->pw_dir)) != 0 ||
690: (r = sshbuf_put_cstring(m, pwent->pw_shell)) != 0)
691: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.94 dtucker 692:
693: out:
1.167 djm 694: ssh_packet_set_log_preamble(ssh, "%suser %s",
695: authctxt->valid ? "authenticating" : "invalid ", authctxt->user);
1.183 markus 696: if ((r = sshbuf_put_string(m, &options, sizeof(options))) != 0)
697: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.112 djm 698:
699: #define M_CP_STROPT(x) do { \
1.183 markus 700: if (options.x != NULL) { \
701: if ((r = sshbuf_put_cstring(m, options.x)) != 0) \
702: fatal("%s: buffer error: %s", \
703: __func__, ssh_err(r)); \
704: } \
1.112 djm 705: } while (0)
1.113 djm 706: #define M_CP_STRARRAYOPT(x, nx) do { \
1.183 markus 707: for (i = 0; i < options.nx; i++) { \
708: if ((r = sshbuf_put_cstring(m, options.x[i])) != 0) \
709: fatal("%s: buffer error: %s", \
710: __func__, ssh_err(r)); \
711: } \
1.113 djm 712: } while (0)
1.112 djm 713: /* See comment in servconf.h */
714: COPY_MATCH_STRING_OPTS();
715: #undef M_CP_STROPT
1.113 djm 716: #undef M_CP_STRARRAYOPT
1.118 djm 717:
718: /* Create valid auth method lists */
1.162 markus 719: if (auth2_setup_methods_lists(authctxt) != 0) {
1.118 djm 720: /*
721: * The monitor will continue long enough to let the child
722: * run to it's packet_disconnect(), but it must not allow any
723: * authentication to succeed.
724: */
725: debug("%s: no valid authentication method lists", __func__);
726: }
727:
1.14 markus 728: debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
1.59 avsm 729: mm_request_send(sock, MONITOR_ANS_PWNAM, m);
1.1 provos 730:
1.162 markus 731: /* Allow service/style information on the auth context */
732: monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
733: monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
1.10 djm 734:
735: return (0);
736: }
737:
1.183 markus 738: int mm_answer_auth2_read_banner(int sock, struct sshbuf *m)
1.10 djm 739: {
740: char *banner;
1.183 markus 741: int r;
1.10 djm 742:
1.183 markus 743: sshbuf_reset(m);
1.10 djm 744: banner = auth2_read_banner();
1.183 markus 745: if ((r = sshbuf_put_cstring(m, banner != NULL ? banner : "")) != 0)
746: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.59 avsm 747: mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
1.124 djm 748: free(banner);
1.1 provos 749:
750: return (0);
751: }
752:
753: int
1.183 markus 754: mm_answer_authserv(int sock, struct sshbuf *m)
1.1 provos 755: {
1.183 markus 756: int r;
757:
1.1 provos 758: monitor_permit_authentications(1);
759:
1.183 markus 760: if ((r = sshbuf_get_cstring(m, &authctxt->service, NULL)) != 0 ||
761: (r = sshbuf_get_cstring(m, &authctxt->style, NULL)) != 0)
762: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.6 stevesk 763: debug3("%s: service=%s, style=%s",
1.14 markus 764: __func__, authctxt->service, authctxt->style);
1.6 stevesk 765:
1.1 provos 766: if (strlen(authctxt->style) == 0) {
1.124 djm 767: free(authctxt->style);
1.1 provos 768: authctxt->style = NULL;
769: }
770:
771: return (0);
772: }
773:
774: int
1.183 markus 775: mm_answer_authpassword(int sock, struct sshbuf *m)
1.1 provos 776: {
1.180 djm 777: struct ssh *ssh = active_state; /* XXX */
1.1 provos 778: static int call_count;
779: char *passwd;
1.183 markus 780: int r, authenticated;
781: size_t plen;
1.1 provos 782:
1.164 djm 783: if (!options.password_authentication)
784: fatal("%s: password authentication not enabled", __func__);
1.183 markus 785: if ((r = sshbuf_get_cstring(m, &passwd, &plen)) != 0)
786: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 787: /* Only authenticate if the context is valid */
1.12 markus 788: authenticated = options.password_authentication &&
1.180 djm 789: auth_password(ssh, passwd);
1.183 markus 790: explicit_bzero(passwd, plen);
1.124 djm 791: free(passwd);
1.1 provos 792:
1.183 markus 793: sshbuf_reset(m);
794: if ((r = sshbuf_put_u32(m, authenticated)) != 0)
795: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 796:
1.14 markus 797: debug3("%s: sending result %d", __func__, authenticated);
1.59 avsm 798: mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
1.1 provos 799:
800: call_count++;
801: if (plen == 0 && call_count == 1)
802: auth_method = "none";
803: else
804: auth_method = "password";
805:
806: /* Causes monitor loop to terminate if authenticated */
807: return (authenticated);
808: }
809:
810: int
1.183 markus 811: mm_answer_bsdauthquery(int sock, struct sshbuf *m)
1.1 provos 812: {
813: char *name, *infotxt;
1.183 markus 814: u_int numprompts, *echo_on, success;
1.1 provos 815: char **prompts;
1.183 markus 816: int r;
1.1 provos 817:
1.164 djm 818: if (!options.kbd_interactive_authentication)
819: fatal("%s: kbd-int authentication not enabled", __func__);
1.31 markus 820: success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
821: &prompts, &echo_on) < 0 ? 0 : 1;
1.1 provos 822:
1.183 markus 823: sshbuf_reset(m);
824: if ((r = sshbuf_put_u32(m, success)) != 0)
825: fatal("%s: buffer error: %s", __func__, ssh_err(r));
826: if (success) {
827: if ((r = sshbuf_put_cstring(m, prompts[0])) != 0)
828: fatal("%s: buffer error: %s", __func__, ssh_err(r));
829: }
1.1 provos 830:
1.31 markus 831: debug3("%s: sending challenge success: %u", __func__, success);
1.59 avsm 832: mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
1.1 provos 833:
1.31 markus 834: if (success) {
1.124 djm 835: free(name);
836: free(infotxt);
837: free(prompts);
838: free(echo_on);
1.1 provos 839: }
840:
841: return (0);
842: }
843:
844: int
1.183 markus 845: mm_answer_bsdauthrespond(int sock, struct sshbuf *m)
1.1 provos 846: {
847: char *response;
1.183 markus 848: int r, authok;
1.1 provos 849:
1.164 djm 850: if (!options.kbd_interactive_authentication)
851: fatal("%s: kbd-int authentication not enabled", __func__);
1.154 mmcc 852: if (authctxt->as == NULL)
1.14 markus 853: fatal("%s: no bsd auth session", __func__);
1.1 provos 854:
1.183 markus 855: if ((r = sshbuf_get_cstring(m, &response, NULL)) != 0)
856: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.12 markus 857: authok = options.challenge_response_authentication &&
858: auth_userresponse(authctxt->as, response, 0);
1.1 provos 859: authctxt->as = NULL;
1.14 markus 860: debug3("%s: <%s> = <%d>", __func__, response, authok);
1.124 djm 861: free(response);
1.1 provos 862:
1.183 markus 863: sshbuf_reset(m);
864: if ((r = sshbuf_put_u32(m, authok)) != 0)
865: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 866:
1.14 markus 867: debug3("%s: sending authenticated: %d", __func__, authok);
1.59 avsm 868: mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
1.1 provos 869:
1.162 markus 870: auth_method = "keyboard-interactive";
871: auth_submethod = "bsdauth";
1.1 provos 872:
873: return (authok != 0);
874: }
875:
876: int
1.183 markus 877: mm_answer_keyallowed(int sock, struct sshbuf *m)
1.1 provos 878: {
1.180 djm 879: struct ssh *ssh = active_state; /* XXX */
1.183 markus 880: struct sshkey *key = NULL;
1.26 markus 881: char *cuser, *chost;
1.183 markus 882: u_int pubkey_auth_attempt;
1.1 provos 883: enum mm_keytype type = 0;
1.180 djm 884: int r, allowed = 0;
885: struct sshauthopt *opts = NULL;
1.1 provos 886:
1.14 markus 887: debug3("%s entering", __func__);
1.183 markus 888: if ((r = sshbuf_get_u32(m, &type)) != 0 ||
889: (r = sshbuf_get_cstring(m, &cuser, NULL)) != 0 ||
890: (r = sshbuf_get_cstring(m, &chost, NULL)) != 0 ||
891: (r = sshkey_froms(m, &key)) != 0 ||
892: (r = sshbuf_get_u32(m, &pubkey_auth_attempt)) != 0)
893: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 894:
1.14 markus 895: debug3("%s: key_from_blob: %p", __func__, key);
1.1 provos 896:
1.51 djm 897: if (key != NULL && authctxt->valid) {
1.137 djm 898: /* These should not make it past the privsep child */
1.185 ! markus 899: if (sshkey_type_plain(key->type) == KEY_RSA &&
1.137 djm 900: (datafellows & SSH_BUG_RSASIGMD5) != 0)
901: fatal("%s: passed a SSH_BUG_RSASIGMD5 key", __func__);
902:
1.63 deraadt 903: switch (type) {
1.1 provos 904: case MM_USERKEY:
1.77 dtucker 905: auth_method = "publickey";
1.180 djm 906: if (!options.pubkey_authentication)
907: break;
908: if (auth2_key_already_used(authctxt, key))
909: break;
910: if (match_pattern_list(sshkey_ssh_name(key),
911: options.pubkey_key_types, 0) != 1)
912: break;
913: allowed = user_key_allowed(ssh, authctxt->pw, key,
914: pubkey_auth_attempt, &opts);
1.1 provos 915: break;
916: case MM_HOSTKEY:
1.180 djm 917: auth_method = "hostbased";
918: if (!options.hostbased_authentication)
919: break;
920: if (auth2_key_already_used(authctxt, key))
921: break;
922: if (match_pattern_list(sshkey_ssh_name(key),
923: options.hostbased_key_types, 0) != 1)
924: break;
925: allowed = hostbased_key_allowed(authctxt->pw,
1.1 provos 926: cuser, chost, key);
1.172 djm 927: auth2_record_info(authctxt,
1.126 djm 928: "client user \"%.100s\", client host \"%.100s\"",
929: cuser, chost);
1.1 provos 930: break;
931: default:
1.14 markus 932: fatal("%s: unknown key type %d", __func__, type);
1.1 provos 933: break;
934: }
1.33 markus 935: }
1.161 djm 936:
1.180 djm 937: debug3("%s: %s authentication%s: %s key is %s", __func__,
938: auth_method, pubkey_auth_attempt ? "" : " test",
939: (key == NULL || !authctxt->valid) ? "invalid" : sshkey_type(key),
940: allowed ? "allowed" : "not allowed");
1.161 djm 941:
1.172 djm 942: auth2_record_key(authctxt, 0, key);
1.1 provos 943:
944: /* clear temporarily storage (used by verify) */
945: monitor_reset_key_state();
946:
947: if (allowed) {
948: /* Save temporarily for comparison in verify */
1.183 markus 949: if ((r = sshkey_to_blob(key, &key_blob, &key_bloblen)) != 0)
950: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 951: key_blobtype = type;
1.180 djm 952: key_opts = opts;
1.1 provos 953: hostbased_cuser = cuser;
954: hostbased_chost = chost;
1.72 djm 955: } else {
1.77 dtucker 956: /* Log failed attempt */
1.125 djm 957: auth_log(authctxt, 0, 0, auth_method, NULL);
1.124 djm 958: free(cuser);
959: free(chost);
1.1 provos 960: }
1.183 markus 961: sshkey_free(key);
1.1 provos 962:
1.183 markus 963: sshbuf_reset(m);
964: if ((r = sshbuf_put_u32(m, allowed)) != 0)
965: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.180 djm 966: if (opts != NULL && (r = sshauthopt_serialise(opts, m, 1)) != 0)
967: fatal("%s: sshauthopt_serialise: %s", __func__, ssh_err(r));
968: mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
1.1 provos 969:
1.180 djm 970: if (!allowed)
971: sshauthopt_free(opts);
1.1 provos 972:
973: return (0);
974: }
975:
976: static int
977: monitor_valid_userblob(u_char *data, u_int datalen)
978: {
1.183 markus 979: struct sshbuf *b;
980: const u_char *p;
1.159 djm 981: char *userstyle, *cp;
1.183 markus 982: size_t len;
983: u_char type;
984: int r, fail = 0;
1.1 provos 985:
1.183 markus 986: if ((b = sshbuf_new()) == NULL)
987: fatal("%s: sshbuf_new", __func__);
988: if ((r = sshbuf_put(b, data, datalen)) != 0)
989: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.3 markus 990:
1.1 provos 991: if (datafellows & SSH_OLD_SESSIONID) {
1.183 markus 992: p = sshbuf_ptr(b);
993: len = sshbuf_len(b);
1.13 markus 994: if ((session_id2 == NULL) ||
995: (len < session_id2_len) ||
1.108 djm 996: (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1.13 markus 997: fail++;
1.183 markus 998: if ((r = sshbuf_consume(b, session_id2_len)) != 0)
999: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 1000: } else {
1.183 markus 1001: if ((r = sshbuf_get_string_direct(b, &p, &len)) != 0)
1002: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.13 markus 1003: if ((session_id2 == NULL) ||
1004: (len != session_id2_len) ||
1.108 djm 1005: (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1.1 provos 1006: fail++;
1007: }
1.183 markus 1008: if ((r = sshbuf_get_u8(b, &type)) != 0)
1009: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1010: if (type != SSH2_MSG_USERAUTH_REQUEST)
1.1 provos 1011: fail++;
1.183 markus 1012: if ((r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
1013: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.121 djm 1014: xasprintf(&userstyle, "%s%s%s", authctxt->user,
1015: authctxt->style ? ":" : "",
1016: authctxt->style ? authctxt->style : "");
1.159 djm 1017: if (strcmp(userstyle, cp) != 0) {
1018: logit("wrong user name passed to monitor: "
1019: "expected %s != %.100s", userstyle, cp);
1.1 provos 1020: fail++;
1021: }
1.124 djm 1022: free(userstyle);
1.159 djm 1023: free(cp);
1.183 markus 1024: if ((r = sshbuf_skip_string(b)) != 0 || /* service */
1025: (r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
1026: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.178 djm 1027: if (strcmp("publickey", cp) != 0)
1028: fail++;
1029: free(cp);
1.183 markus 1030: if ((r = sshbuf_get_u8(b, &type)) != 0)
1031: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1032: if (type == 0)
1.178 djm 1033: fail++;
1.183 markus 1034: if ((r = sshbuf_skip_string(b)) != 0 || /* pkalg */
1035: (r = sshbuf_skip_string(b)) != 0) /* pkblob */
1036: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1037: if (sshbuf_len(b) != 0)
1.1 provos 1038: fail++;
1.183 markus 1039: sshbuf_free(b);
1.1 provos 1040: return (fail == 0);
1041: }
1042:
1043: static int
1.26 markus 1044: monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1045: char *chost)
1.1 provos 1046: {
1.183 markus 1047: struct sshbuf *b;
1048: const u_char *p;
1049: char *cp, *userstyle;
1050: size_t len;
1051: int r, fail = 0;
1052: u_char type;
1.1 provos 1053:
1.183 markus 1054: if ((b = sshbuf_new()) == NULL)
1055: fatal("%s: sshbuf_new", __func__);
1056: if ((r = sshbuf_put(b, data, datalen)) != 0 ||
1057: (r = sshbuf_get_string_direct(b, &p, &len)) != 0)
1058: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.3 markus 1059:
1.13 markus 1060: if ((session_id2 == NULL) ||
1061: (len != session_id2_len) ||
1.108 djm 1062: (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1.1 provos 1063: fail++;
1.13 markus 1064:
1.183 markus 1065: if ((r = sshbuf_get_u8(b, &type)) != 0)
1066: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1067: if (type != SSH2_MSG_USERAUTH_REQUEST)
1.1 provos 1068: fail++;
1.183 markus 1069: if ((r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
1070: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.121 djm 1071: xasprintf(&userstyle, "%s%s%s", authctxt->user,
1072: authctxt->style ? ":" : "",
1073: authctxt->style ? authctxt->style : "");
1.183 markus 1074: if (strcmp(userstyle, cp) != 0) {
1075: logit("wrong user name passed to monitor: "
1076: "expected %s != %.100s", userstyle, cp);
1.1 provos 1077: fail++;
1078: }
1.121 djm 1079: free(userstyle);
1.183 markus 1080: free(cp);
1081: if ((r = sshbuf_skip_string(b)) != 0 || /* service */
1082: (r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
1083: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1084: if (strcmp(cp, "hostbased") != 0)
1.1 provos 1085: fail++;
1.183 markus 1086: free(cp);
1087: if ((r = sshbuf_skip_string(b)) != 0 || /* pkalg */
1088: (r = sshbuf_skip_string(b)) != 0) /* pkblob */
1089: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 1090:
1091: /* verify client host, strip trailing dot if necessary */
1.183 markus 1092: if ((r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
1093: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1094: if (((len = strlen(cp)) > 0) && cp[len - 1] == '.')
1095: cp[len - 1] = '\0';
1096: if (strcmp(cp, chost) != 0)
1.1 provos 1097: fail++;
1.183 markus 1098: free(cp);
1.1 provos 1099:
1100: /* verify client user */
1.183 markus 1101: if ((r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
1102: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1103: if (strcmp(cp, cuser) != 0)
1.1 provos 1104: fail++;
1.183 markus 1105: free(cp);
1.1 provos 1106:
1.183 markus 1107: if (sshbuf_len(b) != 0)
1.1 provos 1108: fail++;
1.183 markus 1109: sshbuf_free(b);
1.1 provos 1110: return (fail == 0);
1111: }
1112:
1113: int
1.169 markus 1114: mm_answer_keyverify(int sock, struct sshbuf *m)
1.1 provos 1115: {
1.180 djm 1116: struct ssh *ssh = active_state; /* XXX */
1.168 markus 1117: struct sshkey *key;
1.1 provos 1118: u_char *signature, *data, *blob;
1.176 djm 1119: char *sigalg;
1.169 markus 1120: size_t signaturelen, datalen, bloblen;
1121: int r, ret, valid_data = 0, encoded_ret;
1.1 provos 1122:
1.169 markus 1123: if ((r = sshbuf_get_string(m, &blob, &bloblen)) != 0 ||
1124: (r = sshbuf_get_string(m, &signature, &signaturelen)) != 0 ||
1.176 djm 1125: (r = sshbuf_get_string(m, &data, &datalen)) != 0 ||
1126: (r = sshbuf_get_cstring(m, &sigalg, NULL)) != 0)
1.169 markus 1127: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 1128:
1129: if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1.8 mouring 1130: !monitor_allowed_key(blob, bloblen))
1.14 markus 1131: fatal("%s: bad key, not previously allowed", __func__);
1.1 provos 1132:
1.177 djm 1133: /* Empty signature algorithm means NULL. */
1134: if (*sigalg == '\0') {
1135: free(sigalg);
1136: sigalg = NULL;
1137: }
1138:
1.169 markus 1139: /* XXX use sshkey_froms here; need to change key_blob, etc. */
1140: if ((r = sshkey_from_blob(blob, bloblen, &key)) != 0)
1141: fatal("%s: bad public key blob: %s", __func__, ssh_err(r));
1.1 provos 1142:
1143: switch (key_blobtype) {
1144: case MM_USERKEY:
1145: valid_data = monitor_valid_userblob(data, datalen);
1.172 djm 1146: auth_method = "publickey";
1.1 provos 1147: break;
1148: case MM_HOSTKEY:
1149: valid_data = monitor_valid_hostbasedblob(data, datalen,
1150: hostbased_cuser, hostbased_chost);
1.172 djm 1151: auth_method = "hostbased";
1.1 provos 1152: break;
1153: default:
1154: valid_data = 0;
1155: break;
1156: }
1157: if (!valid_data)
1.14 markus 1158: fatal("%s: bad signature data blob", __func__);
1.1 provos 1159:
1.169 markus 1160: ret = sshkey_verify(key, signature, signaturelen, data, datalen,
1.176 djm 1161: sigalg, active_state->compat);
1.172 djm 1162: debug3("%s: %s %p signature %s", __func__, auth_method, key,
1163: (ret == 0) ? "verified" : "unverified");
1164: auth2_record_key(authctxt, ret == 0, key);
1.136 djm 1165:
1.124 djm 1166: free(blob);
1167: free(signature);
1168: free(data);
1.177 djm 1169: free(sigalg);
1.1 provos 1170:
1.180 djm 1171: if (key_blobtype == MM_USERKEY)
1172: auth_activate_options(ssh, key_opts);
1.1 provos 1173: monitor_reset_key_state();
1.3 markus 1174:
1.172 djm 1175: sshkey_free(key);
1.169 markus 1176: sshbuf_reset(m);
1177:
1178: /* encode ret != 0 as positive integer, since we're sending u32 */
1179: encoded_ret = (ret != 0);
1180: if ((r = sshbuf_put_u32(m, encoded_ret)) != 0)
1181: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.59 avsm 1182: mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
1.1 provos 1183:
1.169 markus 1184: return ret == 0;
1.1 provos 1185: }
1186:
1.2 markus 1187: static void
1.1 provos 1188: mm_record_login(Session *s, struct passwd *pw)
1189: {
1.158 djm 1190: struct ssh *ssh = active_state; /* XXX */
1.1 provos 1191: socklen_t fromlen;
1192: struct sockaddr_storage from;
1193:
1194: /*
1195: * Get IP address of client. If the connection is not a socket, let
1196: * the address be 0.0.0.0.
1197: */
1198: memset(&from, 0, sizeof(from));
1.24 stevesk 1199: fromlen = sizeof(from);
1.1 provos 1200: if (packet_connection_is_on_socket()) {
1201: if (getpeername(packet_get_connection_in(),
1.74 deraadt 1202: (struct sockaddr *)&from, &fromlen) < 0) {
1.1 provos 1203: debug("getpeername: %.100s", strerror(errno));
1.50 markus 1204: cleanup_exit(255);
1.1 provos 1205: }
1206: }
1207: /* Record that there was a login on that tty from the remote host. */
1208: record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1.158 djm 1209: session_get_remote_name_or_ip(ssh, utmp_len, options.use_dns),
1.24 stevesk 1210: (struct sockaddr *)&from, fromlen);
1.1 provos 1211: }
1212:
1213: static void
1214: mm_session_close(Session *s)
1215: {
1.41 djm 1216: debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
1.1 provos 1217: if (s->ttyfd != -1) {
1.86 stevesk 1218: debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1.1 provos 1219: session_pty_cleanup2(s);
1220: }
1.96 djm 1221: session_unused(s->self);
1.1 provos 1222: }
1223:
1224: int
1.183 markus 1225: mm_answer_pty(int sock, struct sshbuf *m)
1.1 provos 1226: {
1.11 mouring 1227: extern struct monitor *pmonitor;
1.1 provos 1228: Session *s;
1.183 markus 1229: int r, res, fd0;
1.1 provos 1230:
1.14 markus 1231: debug3("%s entering", __func__);
1.1 provos 1232:
1.183 markus 1233: sshbuf_reset(m);
1.1 provos 1234: s = session_new();
1235: if (s == NULL)
1236: goto error;
1237: s->authctxt = authctxt;
1238: s->pw = authctxt->pw;
1.11 mouring 1239: s->pid = pmonitor->m_pid;
1.1 provos 1240: res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1241: if (res == 0)
1242: goto error;
1243: pty_setowner(authctxt->pw, s->tty);
1244:
1.183 markus 1245: if ((r = sshbuf_put_u32(m, 1)) != 0 ||
1246: (r = sshbuf_put_cstring(m, s->tty)) != 0)
1247: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 1248:
1249: /* We need to trick ttyslot */
1250: if (dup2(s->ttyfd, 0) == -1)
1.14 markus 1251: fatal("%s: dup2", __func__);
1.1 provos 1252:
1253: mm_record_login(s, authctxt->pw);
1254:
1255: /* Now we can close the file descriptor again */
1256: close(0);
1.61 dtucker 1257:
1258: /* send messages generated by record_login */
1.183 markus 1259: if ((r = sshbuf_put_stringb(m, loginmsg)) != 0)
1260: fatal("%s: put login message: %s", __func__, ssh_err(r));
1261: sshbuf_reset(loginmsg);
1.61 dtucker 1262:
1263: mm_request_send(sock, MONITOR_ANS_PTY, m);
1264:
1.92 djm 1265: if (mm_send_fd(sock, s->ptyfd) == -1 ||
1266: mm_send_fd(sock, s->ttyfd) == -1)
1267: fatal("%s: send fds failed", __func__);
1.1 provos 1268:
1269: /* make sure nothing uses fd 0 */
1270: if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1.14 markus 1271: fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
1.1 provos 1272: if (fd0 != 0)
1.14 markus 1273: error("%s: fd0 %d != 0", __func__, fd0);
1.1 provos 1274:
1275: /* slave is not needed */
1276: close(s->ttyfd);
1277: s->ttyfd = s->ptyfd;
1278: /* no need to dup() because nobody closes ptyfd */
1279: s->ptymaster = s->ptyfd;
1280:
1.86 stevesk 1281: debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
1.1 provos 1282:
1283: return (0);
1284:
1285: error:
1286: if (s != NULL)
1287: mm_session_close(s);
1.183 markus 1288: if ((r = sshbuf_put_u32(m, 0)) != 0)
1289: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.59 avsm 1290: mm_request_send(sock, MONITOR_ANS_PTY, m);
1.1 provos 1291: return (0);
1292: }
1293:
1294: int
1.183 markus 1295: mm_answer_pty_cleanup(int sock, struct sshbuf *m)
1.1 provos 1296: {
1297: Session *s;
1298: char *tty;
1.183 markus 1299: int r;
1.1 provos 1300:
1.14 markus 1301: debug3("%s entering", __func__);
1.1 provos 1302:
1.183 markus 1303: if ((r = sshbuf_get_cstring(m, &tty, NULL)) != 0)
1304: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 1305: if ((s = session_by_tty(tty)) != NULL)
1306: mm_session_close(s);
1.183 markus 1307: sshbuf_reset(m);
1.124 djm 1308: free(tty);
1.1 provos 1309: return (0);
1310: }
1311:
1312: int
1.183 markus 1313: mm_answer_term(int sock, struct sshbuf *req)
1.1 provos 1314: {
1.173 djm 1315: struct ssh *ssh = active_state; /* XXX */
1.11 mouring 1316: extern struct monitor *pmonitor;
1.1 provos 1317: int res, status;
1318:
1.14 markus 1319: debug3("%s: tearing down sessions", __func__);
1.1 provos 1320:
1321: /* The child is terminating */
1.173 djm 1322: session_destroy_all(ssh, &mm_session_close);
1.1 provos 1323:
1.11 mouring 1324: while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1.9 markus 1325: if (errno != EINTR)
1326: exit(1);
1.1 provos 1327:
1328: res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1329:
1330: /* Terminate process */
1.57 deraadt 1331: exit(res);
1.170 markus 1332: }
1333:
1334: void
1335: monitor_clear_keystate(struct monitor *pmonitor)
1336: {
1337: struct ssh *ssh = active_state; /* XXX */
1338:
1339: ssh_clear_newkeys(ssh, MODE_IN);
1340: ssh_clear_newkeys(ssh, MODE_OUT);
1341: sshbuf_free(child_state);
1342: child_state = NULL;
1.1 provos 1343: }
1344:
1345: void
1.11 mouring 1346: monitor_apply_keystate(struct monitor *pmonitor)
1.1 provos 1347: {
1.139 markus 1348: struct ssh *ssh = active_state; /* XXX */
1349: struct kex *kex;
1350: int r;
1351:
1352: debug3("%s: packet_set_state", __func__);
1353: if ((r = ssh_packet_set_state(ssh, child_state)) != 0)
1354: fatal("%s: packet_set_state: %s", __func__, ssh_err(r));
1355: sshbuf_free(child_state);
1356: child_state = NULL;
1357:
1.154 mmcc 1358: if ((kex = ssh->kex) != NULL) {
1.139 markus 1359: /* XXX set callbacks */
1.147 djm 1360: #ifdef WITH_OPENSSL
1.139 markus 1361: kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1362: kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
1.160 djm 1363: kex->kex[KEX_DH_GRP14_SHA256] = kexdh_server;
1364: kex->kex[KEX_DH_GRP16_SHA512] = kexdh_server;
1365: kex->kex[KEX_DH_GRP18_SHA512] = kexdh_server;
1.139 markus 1366: kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
1367: kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
1368: kex->kex[KEX_ECDH_SHA2] = kexecdh_server;
1.147 djm 1369: #endif
1.139 markus 1370: kex->kex[KEX_C25519_SHA256] = kexc25519_server;
1371: kex->load_host_public_key=&get_hostkey_public_by_type;
1372: kex->load_host_private_key=&get_hostkey_private_by_type;
1373: kex->host_key_index=&get_hostkey_index;
1374: kex->sign = sshd_hostkey_sign;
1375: }
1.1 provos 1376: }
1377:
1378: /* This function requries careful sanity checking */
1379:
1380: void
1.11 mouring 1381: mm_get_keystate(struct monitor *pmonitor)
1.1 provos 1382: {
1.14 markus 1383: debug3("%s: Waiting for new keys", __func__);
1.1 provos 1384:
1.139 markus 1385: if ((child_state = sshbuf_new()) == NULL)
1386: fatal("%s: sshbuf_new failed", __func__);
1387: mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT,
1388: child_state);
1389: debug3("%s: GOT new keys", __func__);
1.1 provos 1390: }
1391:
1392:
1393: /* XXX */
1394:
1395: #define FD_CLOSEONEXEC(x) do { \
1.111 djm 1396: if (fcntl(x, F_SETFD, FD_CLOEXEC) == -1) \
1.1 provos 1397: fatal("fcntl(%d, F_SETFD)", x); \
1398: } while (0)
1399:
1.2 markus 1400: static void
1.114 djm 1401: monitor_openfds(struct monitor *mon, int do_logfds)
1.3 markus 1402: {
1.114 djm 1403: int pair[2];
1.171 markus 1404: #ifdef SO_ZEROIZE
1405: int on = 1;
1406: #endif
1.114 djm 1407:
1.1 provos 1408: if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1.114 djm 1409: fatal("%s: socketpair: %s", __func__, strerror(errno));
1.171 markus 1410: #ifdef SO_ZEROIZE
1411: if (setsockopt(pair[0], SOL_SOCKET, SO_ZEROIZE, &on, sizeof(on)) < 0)
1412: error("setsockopt SO_ZEROIZE(0): %.100s", strerror(errno));
1413: if (setsockopt(pair[1], SOL_SOCKET, SO_ZEROIZE, &on, sizeof(on)) < 0)
1414: error("setsockopt SO_ZEROIZE(1): %.100s", strerror(errno));
1415: #endif
1.1 provos 1416: FD_CLOSEONEXEC(pair[0]);
1417: FD_CLOSEONEXEC(pair[1]);
1.114 djm 1418: mon->m_recvfd = pair[0];
1419: mon->m_sendfd = pair[1];
1420:
1421: if (do_logfds) {
1422: if (pipe(pair) == -1)
1423: fatal("%s: pipe: %s", __func__, strerror(errno));
1424: FD_CLOSEONEXEC(pair[0]);
1425: FD_CLOSEONEXEC(pair[1]);
1426: mon->m_log_recvfd = pair[0];
1427: mon->m_log_sendfd = pair[1];
1428: } else
1429: mon->m_log_recvfd = mon->m_log_sendfd = -1;
1.1 provos 1430: }
1431:
1432: #define MM_MEMSIZE 65536
1433:
1434: struct monitor *
1435: monitor_init(void)
1436: {
1437: struct monitor *mon;
1438:
1.75 djm 1439: mon = xcalloc(1, sizeof(*mon));
1.114 djm 1440: monitor_openfds(mon, 1);
1.1 provos 1441:
1442: return mon;
1443: }
1444:
1445: void
1446: monitor_reinit(struct monitor *mon)
1447: {
1.114 djm 1448: monitor_openfds(mon, 0);
1.1 provos 1449: }
1.46 markus 1450:
1451: #ifdef GSSAPI
1452: int
1.183 markus 1453: mm_answer_gss_setup_ctx(int sock, struct sshbuf *m)
1.46 markus 1454: {
1.59 avsm 1455: gss_OID_desc goid;
1.46 markus 1456: OM_uint32 major;
1.183 markus 1457: size_t len;
1.184 djm 1458: u_char *p;
1.183 markus 1459: int r;
1.46 markus 1460:
1.164 djm 1461: if (!options.gss_authentication)
1462: fatal("%s: GSSAPI authentication not enabled", __func__);
1463:
1.184 djm 1464: if ((r = sshbuf_get_string(m, &p, &len)) != 0)
1.183 markus 1465: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.184 djm 1466: goid.elements = p;
1.59 avsm 1467: goid.length = len;
1.46 markus 1468:
1.59 avsm 1469: major = ssh_gssapi_server_ctx(&gsscontext, &goid);
1.46 markus 1470:
1.124 djm 1471: free(goid.elements);
1.46 markus 1472:
1.183 markus 1473: sshbuf_reset(m);
1474: if ((r = sshbuf_put_u32(m, major)) != 0)
1475: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.46 markus 1476:
1.64 stevesk 1477: mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
1.46 markus 1478:
1479: /* Now we have a context, enable the step */
1480: monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1481:
1482: return (0);
1483: }
1484:
1485: int
1.183 markus 1486: mm_answer_gss_accept_ctx(int sock, struct sshbuf *m)
1.46 markus 1487: {
1488: gss_buffer_desc in;
1489: gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
1.64 stevesk 1490: OM_uint32 major, minor;
1.46 markus 1491: OM_uint32 flags = 0; /* GSI needs this */
1.183 markus 1492: int r;
1.46 markus 1493:
1.164 djm 1494: if (!options.gss_authentication)
1495: fatal("%s: GSSAPI authentication not enabled", __func__);
1496:
1.184 djm 1497: if ((r = ssh_gssapi_get_buffer_desc(m, &in)) != 0)
1.183 markus 1498: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.46 markus 1499: major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1.124 djm 1500: free(in.value);
1.46 markus 1501:
1.183 markus 1502: sshbuf_reset(m);
1503: if ((r = sshbuf_put_u32(m, major)) != 0 ||
1504: (r = sshbuf_put_string(m, out.value, out.length)) != 0 ||
1505: (r = sshbuf_put_u32(m, flags)) != 0)
1506: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.59 avsm 1507: mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
1.46 markus 1508:
1509: gss_release_buffer(&minor, &out);
1510:
1.64 stevesk 1511: if (major == GSS_S_COMPLETE) {
1.46 markus 1512: monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
1513: monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1.52 markus 1514: monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
1.46 markus 1515: }
1516: return (0);
1517: }
1518:
1519: int
1.183 markus 1520: mm_answer_gss_checkmic(int sock, struct sshbuf *m)
1.52 markus 1521: {
1522: gss_buffer_desc gssbuf, mic;
1523: OM_uint32 ret;
1.184 djm 1524: int r;
1.54 djm 1525:
1.164 djm 1526: if (!options.gss_authentication)
1527: fatal("%s: GSSAPI authentication not enabled", __func__);
1528:
1.184 djm 1529: if ((r = ssh_gssapi_get_buffer_desc(m, &gssbuf)) != 0 ||
1530: (r = ssh_gssapi_get_buffer_desc(m, &mic)) != 0)
1.183 markus 1531: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.54 djm 1532:
1.52 markus 1533: ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
1.54 djm 1534:
1.124 djm 1535: free(gssbuf.value);
1536: free(mic.value);
1.54 djm 1537:
1.183 markus 1538: sshbuf_reset(m);
1539: if ((r = sshbuf_put_u32(m, ret)) != 0)
1540: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.54 djm 1541:
1.59 avsm 1542: mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
1.54 djm 1543:
1.52 markus 1544: if (!GSS_ERROR(ret))
1545: monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1.54 djm 1546:
1.52 markus 1547: return (0);
1548: }
1549:
1550: int
1.183 markus 1551: mm_answer_gss_userok(int sock, struct sshbuf *m)
1.46 markus 1552: {
1.184 djm 1553: int r, authenticated;
1.172 djm 1554: const char *displayname;
1.164 djm 1555:
1556: if (!options.gss_authentication)
1557: fatal("%s: GSSAPI authentication not enabled", __func__);
1.46 markus 1558:
1559: authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1560:
1.183 markus 1561: sshbuf_reset(m);
1562: if ((r = sshbuf_put_u32(m, authenticated)) != 0)
1563: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.46 markus 1564:
1565: debug3("%s: sending result %d", __func__, authenticated);
1.59 avsm 1566: mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
1.46 markus 1567:
1.64 stevesk 1568: auth_method = "gssapi-with-mic";
1.172 djm 1569:
1570: if ((displayname = ssh_gssapi_displayname()) != NULL)
1571: auth2_record_info(authctxt, "%s", displayname);
1.46 markus 1572:
1573: /* Monitor loop will terminate if authenticated */
1574: return (authenticated);
1575: }
1576: #endif /* GSSAPI */
1.100 djm 1577:
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