Annotation of src/usr.bin/ssh/monitor.c, Revision 1.187
1.187 ! djm 1: /* $OpenBSD: monitor.c,v 1.186 2018/07/20 03:46:34 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"
1.1 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;
1.187 ! djm 507: const BIGNUM *dh_p, *dh_g;
1.183 markus 508: int r;
509: u_int min, want, max;
1.1 provos 510:
1.183 markus 511: if ((r = sshbuf_get_u32(m, &min)) != 0 ||
512: (r = sshbuf_get_u32(m, &want)) != 0 ||
513: (r = sshbuf_get_u32(m, &max)) != 0)
514: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 515:
516: debug3("%s: got parameters: %d %d %d",
1.14 markus 517: __func__, min, want, max);
1.1 provos 518: /* We need to check here, too, in case the child got corrupted */
519: if (max < min || want < min || max < want)
520: fatal("%s: bad parameters: %d %d %d",
1.14 markus 521: __func__, min, want, max);
1.1 provos 522:
1.183 markus 523: sshbuf_reset(m);
1.1 provos 524:
525: dh = choose_dh(min, want, max);
526: if (dh == NULL) {
1.183 markus 527: if ((r = sshbuf_put_u8(m, 0)) != 0)
528: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 529: return (0);
530: } else {
531: /* Send first bignum */
1.187 ! djm 532: DH_get0_pqg(dh, &dh_p, NULL, &dh_g);
1.183 markus 533: if ((r = sshbuf_put_u8(m, 1)) != 0 ||
1.187 ! djm 534: (r = sshbuf_put_bignum2(m, dh_p)) != 0 ||
! 535: (r = sshbuf_put_bignum2(m, dh_g)) != 0)
1.183 markus 536: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.3 markus 537:
1.1 provos 538: DH_free(dh);
539: }
1.59 avsm 540: mm_request_send(sock, MONITOR_ANS_MODULI, m);
1.1 provos 541: return (0);
542: }
1.132 markus 543: #endif
1.1 provos 544:
545: int
1.183 markus 546: mm_answer_sign(int sock, struct sshbuf *m)
1.1 provos 547: {
1.144 djm 548: struct ssh *ssh = active_state; /* XXX */
1.138 djm 549: extern int auth_sock; /* XXX move to state struct? */
550: struct sshkey *key;
1.157 djm 551: struct sshbuf *sigbuf = NULL;
552: u_char *p = NULL, *signature = NULL;
553: char *alg = NULL;
1.155 markus 554: size_t datlen, siglen, alglen;
1.159 djm 555: int r, is_proof = 0;
1.185 markus 556: u_int keyid, compat;
1.145 djm 557: const char proof_req[] = "hostkeys-prove-00@openssh.com";
1.3 markus 558:
1.14 markus 559: debug3("%s", __func__);
1.1 provos 560:
1.138 djm 561: if ((r = sshbuf_get_u32(m, &keyid)) != 0 ||
1.155 markus 562: (r = sshbuf_get_string(m, &p, &datlen)) != 0 ||
1.185 markus 563: (r = sshbuf_get_cstring(m, &alg, &alglen)) != 0 ||
564: (r = sshbuf_get_u32(m, &compat)) != 0)
1.138 djm 565: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.159 djm 566: if (keyid > INT_MAX)
567: fatal("%s: invalid key ID", __func__);
1.1 provos 568:
1.69 djm 569: /*
1.110 djm 570: * Supported KEX types use SHA1 (20 bytes), SHA256 (32 bytes),
571: * SHA384 (48 bytes) and SHA512 (64 bytes).
1.144 djm 572: *
573: * Otherwise, verify the signature request is for a hostkey
574: * proof.
575: *
576: * XXX perform similar check for KEX signature requests too?
577: * it's not trivial, since what is signed is the hash, rather
578: * than the full kex structure...
1.69 djm 579: */
1.144 djm 580: if (datlen != 20 && datlen != 32 && datlen != 48 && datlen != 64) {
581: /*
582: * Construct expected hostkey proof and compare it to what
583: * the client sent us.
584: */
585: if (session_id2_len == 0) /* hostkeys is never first */
586: fatal("%s: bad data length: %zu", __func__, datlen);
587: if ((key = get_hostkey_public_by_index(keyid, ssh)) == NULL)
588: fatal("%s: no hostkey for index %d", __func__, keyid);
589: if ((sigbuf = sshbuf_new()) == NULL)
590: fatal("%s: sshbuf_new", __func__);
1.145 djm 591: if ((r = sshbuf_put_cstring(sigbuf, proof_req)) != 0 ||
592: (r = sshbuf_put_string(sigbuf, session_id2,
1.152 jsg 593: session_id2_len)) != 0 ||
1.144 djm 594: (r = sshkey_puts(key, sigbuf)) != 0)
595: fatal("%s: couldn't prepare private key "
596: "proof buffer: %s", __func__, ssh_err(r));
597: if (datlen != sshbuf_len(sigbuf) ||
598: memcmp(p, sshbuf_ptr(sigbuf), sshbuf_len(sigbuf)) != 0)
599: fatal("%s: bad data length: %zu, hostkey proof len %zu",
600: __func__, datlen, sshbuf_len(sigbuf));
601: sshbuf_free(sigbuf);
602: is_proof = 1;
603: }
1.1 provos 604:
1.13 markus 605: /* save session id, it will be passed on the first call */
606: if (session_id2_len == 0) {
607: session_id2_len = datlen;
608: session_id2 = xmalloc(session_id2_len);
609: memcpy(session_id2, p, session_id2_len);
610: }
611:
1.127 markus 612: if ((key = get_hostkey_by_index(keyid)) != NULL) {
1.155 markus 613: if ((r = sshkey_sign(key, &signature, &siglen, p, datlen, alg,
1.185 markus 614: compat)) != 0)
1.138 djm 615: fatal("%s: sshkey_sign failed: %s",
616: __func__, ssh_err(r));
1.144 djm 617: } else if ((key = get_hostkey_public_by_index(keyid, ssh)) != NULL &&
1.138 djm 618: auth_sock > 0) {
619: if ((r = ssh_agent_sign(auth_sock, key, &signature, &siglen,
1.185 markus 620: p, datlen, alg, compat)) != 0) {
1.138 djm 621: fatal("%s: ssh_agent_sign failed: %s",
622: __func__, ssh_err(r));
623: }
1.127 markus 624: } else
1.14 markus 625: fatal("%s: no hostkey from index %d", __func__, keyid);
1.1 provos 626:
1.144 djm 627: debug3("%s: %s signature %p(%zu)", __func__,
628: is_proof ? "KEX" : "hostkey proof", signature, siglen);
1.1 provos 629:
1.138 djm 630: sshbuf_reset(m);
631: if ((r = sshbuf_put_string(m, signature, siglen)) != 0)
632: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 633:
1.157 djm 634: free(alg);
1.124 djm 635: free(p);
636: free(signature);
1.1 provos 637:
1.59 avsm 638: mm_request_send(sock, MONITOR_ANS_SIGN, m);
1.1 provos 639:
640: /* Turn on permissions for getpwnam */
641: monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
642:
643: return (0);
644: }
645:
646: /* Retrieves the password entry and also checks if the user is permitted */
647:
648: int
1.183 markus 649: mm_answer_pwnamallow(int sock, struct sshbuf *m)
1.1 provos 650: {
1.167 djm 651: struct ssh *ssh = active_state; /* XXX */
1.60 dtucker 652: char *username;
1.1 provos 653: struct passwd *pwent;
1.183 markus 654: int r, allowed = 0;
1.113 djm 655: u_int i;
1.3 markus 656:
1.14 markus 657: debug3("%s", __func__);
1.1 provos 658:
659: if (authctxt->attempt++ != 0)
1.14 markus 660: fatal("%s: multiple attempts for getpwnam", __func__);
1.1 provos 661:
1.183 markus 662: if ((r = sshbuf_get_cstring(m, &username, NULL)) != 0)
663: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 664:
1.60 dtucker 665: pwent = getpwnamallow(username);
1.1 provos 666:
1.60 dtucker 667: authctxt->user = xstrdup(username);
668: setproctitle("%s [priv]", pwent ? username : "unknown");
1.124 djm 669: free(username);
1.1 provos 670:
1.183 markus 671: sshbuf_reset(m);
1.1 provos 672:
673: if (pwent == NULL) {
1.183 markus 674: if ((r = sshbuf_put_u8(m, 0)) != 0)
675: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.53 djm 676: authctxt->pw = fakepw();
1.1 provos 677: goto out;
678: }
679:
680: allowed = 1;
1.4 markus 681: authctxt->pw = pwent;
1.1 provos 682: authctxt->valid = 1;
683:
1.183 markus 684: /* XXX don't sent pwent to unpriv; send fake class/dir/shell too */
685: if ((r = sshbuf_put_u8(m, 1)) != 0 ||
686: (r = sshbuf_put_string(m, pwent, sizeof(*pwent))) != 0 ||
687: (r = sshbuf_put_cstring(m, pwent->pw_name)) != 0 ||
688: (r = sshbuf_put_cstring(m, "*")) != 0 ||
689: (r = sshbuf_put_cstring(m, pwent->pw_gecos)) != 0 ||
690: (r = sshbuf_put_cstring(m, pwent->pw_class)) != 0 ||
691: (r = sshbuf_put_cstring(m, pwent->pw_dir)) != 0 ||
692: (r = sshbuf_put_cstring(m, pwent->pw_shell)) != 0)
693: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.94 dtucker 694:
695: out:
1.167 djm 696: ssh_packet_set_log_preamble(ssh, "%suser %s",
697: authctxt->valid ? "authenticating" : "invalid ", authctxt->user);
1.183 markus 698: if ((r = sshbuf_put_string(m, &options, sizeof(options))) != 0)
699: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.112 djm 700:
701: #define M_CP_STROPT(x) do { \
1.183 markus 702: if (options.x != NULL) { \
703: if ((r = sshbuf_put_cstring(m, options.x)) != 0) \
704: fatal("%s: buffer error: %s", \
705: __func__, ssh_err(r)); \
706: } \
1.112 djm 707: } while (0)
1.113 djm 708: #define M_CP_STRARRAYOPT(x, nx) do { \
1.183 markus 709: for (i = 0; i < options.nx; i++) { \
710: if ((r = sshbuf_put_cstring(m, options.x[i])) != 0) \
711: fatal("%s: buffer error: %s", \
712: __func__, ssh_err(r)); \
713: } \
1.113 djm 714: } while (0)
1.112 djm 715: /* See comment in servconf.h */
716: COPY_MATCH_STRING_OPTS();
717: #undef M_CP_STROPT
1.113 djm 718: #undef M_CP_STRARRAYOPT
1.118 djm 719:
720: /* Create valid auth method lists */
1.162 markus 721: if (auth2_setup_methods_lists(authctxt) != 0) {
1.118 djm 722: /*
723: * The monitor will continue long enough to let the child
724: * run to it's packet_disconnect(), but it must not allow any
725: * authentication to succeed.
726: */
727: debug("%s: no valid authentication method lists", __func__);
728: }
729:
1.14 markus 730: debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
1.59 avsm 731: mm_request_send(sock, MONITOR_ANS_PWNAM, m);
1.1 provos 732:
1.162 markus 733: /* Allow service/style information on the auth context */
734: monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
735: monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
1.10 djm 736:
737: return (0);
738: }
739:
1.183 markus 740: int mm_answer_auth2_read_banner(int sock, struct sshbuf *m)
1.10 djm 741: {
742: char *banner;
1.183 markus 743: int r;
1.10 djm 744:
1.183 markus 745: sshbuf_reset(m);
1.10 djm 746: banner = auth2_read_banner();
1.183 markus 747: if ((r = sshbuf_put_cstring(m, banner != NULL ? banner : "")) != 0)
748: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.59 avsm 749: mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
1.124 djm 750: free(banner);
1.1 provos 751:
752: return (0);
753: }
754:
755: int
1.183 markus 756: mm_answer_authserv(int sock, struct sshbuf *m)
1.1 provos 757: {
1.183 markus 758: int r;
759:
1.1 provos 760: monitor_permit_authentications(1);
761:
1.183 markus 762: if ((r = sshbuf_get_cstring(m, &authctxt->service, NULL)) != 0 ||
763: (r = sshbuf_get_cstring(m, &authctxt->style, NULL)) != 0)
764: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.6 stevesk 765: debug3("%s: service=%s, style=%s",
1.14 markus 766: __func__, authctxt->service, authctxt->style);
1.6 stevesk 767:
1.1 provos 768: if (strlen(authctxt->style) == 0) {
1.124 djm 769: free(authctxt->style);
1.1 provos 770: authctxt->style = NULL;
771: }
772:
773: return (0);
774: }
775:
776: int
1.183 markus 777: mm_answer_authpassword(int sock, struct sshbuf *m)
1.1 provos 778: {
1.180 djm 779: struct ssh *ssh = active_state; /* XXX */
1.1 provos 780: static int call_count;
781: char *passwd;
1.183 markus 782: int r, authenticated;
783: size_t plen;
1.1 provos 784:
1.164 djm 785: if (!options.password_authentication)
786: fatal("%s: password authentication not enabled", __func__);
1.183 markus 787: if ((r = sshbuf_get_cstring(m, &passwd, &plen)) != 0)
788: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 789: /* Only authenticate if the context is valid */
1.12 markus 790: authenticated = options.password_authentication &&
1.180 djm 791: auth_password(ssh, passwd);
1.183 markus 792: explicit_bzero(passwd, plen);
1.124 djm 793: free(passwd);
1.1 provos 794:
1.183 markus 795: sshbuf_reset(m);
796: if ((r = sshbuf_put_u32(m, authenticated)) != 0)
797: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 798:
1.14 markus 799: debug3("%s: sending result %d", __func__, authenticated);
1.59 avsm 800: mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
1.1 provos 801:
802: call_count++;
803: if (plen == 0 && call_count == 1)
804: auth_method = "none";
805: else
806: auth_method = "password";
807:
808: /* Causes monitor loop to terminate if authenticated */
809: return (authenticated);
810: }
811:
812: int
1.183 markus 813: mm_answer_bsdauthquery(int sock, struct sshbuf *m)
1.1 provos 814: {
815: char *name, *infotxt;
1.183 markus 816: u_int numprompts, *echo_on, success;
1.1 provos 817: char **prompts;
1.183 markus 818: int r;
1.1 provos 819:
1.164 djm 820: if (!options.kbd_interactive_authentication)
821: fatal("%s: kbd-int authentication not enabled", __func__);
1.31 markus 822: success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
823: &prompts, &echo_on) < 0 ? 0 : 1;
1.1 provos 824:
1.183 markus 825: sshbuf_reset(m);
826: if ((r = sshbuf_put_u32(m, success)) != 0)
827: fatal("%s: buffer error: %s", __func__, ssh_err(r));
828: if (success) {
829: if ((r = sshbuf_put_cstring(m, prompts[0])) != 0)
830: fatal("%s: buffer error: %s", __func__, ssh_err(r));
831: }
1.1 provos 832:
1.31 markus 833: debug3("%s: sending challenge success: %u", __func__, success);
1.59 avsm 834: mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
1.1 provos 835:
1.31 markus 836: if (success) {
1.124 djm 837: free(name);
838: free(infotxt);
839: free(prompts);
840: free(echo_on);
1.1 provos 841: }
842:
843: return (0);
844: }
845:
846: int
1.183 markus 847: mm_answer_bsdauthrespond(int sock, struct sshbuf *m)
1.1 provos 848: {
849: char *response;
1.183 markus 850: int r, authok;
1.1 provos 851:
1.164 djm 852: if (!options.kbd_interactive_authentication)
853: fatal("%s: kbd-int authentication not enabled", __func__);
1.154 mmcc 854: if (authctxt->as == NULL)
1.14 markus 855: fatal("%s: no bsd auth session", __func__);
1.1 provos 856:
1.183 markus 857: if ((r = sshbuf_get_cstring(m, &response, NULL)) != 0)
858: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.12 markus 859: authok = options.challenge_response_authentication &&
860: auth_userresponse(authctxt->as, response, 0);
1.1 provos 861: authctxt->as = NULL;
1.14 markus 862: debug3("%s: <%s> = <%d>", __func__, response, authok);
1.124 djm 863: free(response);
1.1 provos 864:
1.183 markus 865: sshbuf_reset(m);
866: if ((r = sshbuf_put_u32(m, authok)) != 0)
867: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 868:
1.14 markus 869: debug3("%s: sending authenticated: %d", __func__, authok);
1.59 avsm 870: mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
1.1 provos 871:
1.162 markus 872: auth_method = "keyboard-interactive";
873: auth_submethod = "bsdauth";
1.1 provos 874:
875: return (authok != 0);
876: }
877:
878: int
1.183 markus 879: mm_answer_keyallowed(int sock, struct sshbuf *m)
1.1 provos 880: {
1.180 djm 881: struct ssh *ssh = active_state; /* XXX */
1.183 markus 882: struct sshkey *key = NULL;
1.26 markus 883: char *cuser, *chost;
1.183 markus 884: u_int pubkey_auth_attempt;
1.1 provos 885: enum mm_keytype type = 0;
1.180 djm 886: int r, allowed = 0;
887: struct sshauthopt *opts = NULL;
1.1 provos 888:
1.14 markus 889: debug3("%s entering", __func__);
1.183 markus 890: if ((r = sshbuf_get_u32(m, &type)) != 0 ||
891: (r = sshbuf_get_cstring(m, &cuser, NULL)) != 0 ||
892: (r = sshbuf_get_cstring(m, &chost, NULL)) != 0 ||
893: (r = sshkey_froms(m, &key)) != 0 ||
894: (r = sshbuf_get_u32(m, &pubkey_auth_attempt)) != 0)
895: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 896:
1.14 markus 897: debug3("%s: key_from_blob: %p", __func__, key);
1.1 provos 898:
1.51 djm 899: if (key != NULL && authctxt->valid) {
1.137 djm 900: /* These should not make it past the privsep child */
1.185 markus 901: if (sshkey_type_plain(key->type) == KEY_RSA &&
1.137 djm 902: (datafellows & SSH_BUG_RSASIGMD5) != 0)
903: fatal("%s: passed a SSH_BUG_RSASIGMD5 key", __func__);
904:
1.63 deraadt 905: switch (type) {
1.1 provos 906: case MM_USERKEY:
1.77 dtucker 907: auth_method = "publickey";
1.180 djm 908: if (!options.pubkey_authentication)
909: break;
910: if (auth2_key_already_used(authctxt, key))
911: break;
912: if (match_pattern_list(sshkey_ssh_name(key),
913: options.pubkey_key_types, 0) != 1)
914: break;
915: allowed = user_key_allowed(ssh, authctxt->pw, key,
916: pubkey_auth_attempt, &opts);
1.1 provos 917: break;
918: case MM_HOSTKEY:
1.180 djm 919: auth_method = "hostbased";
920: if (!options.hostbased_authentication)
921: break;
922: if (auth2_key_already_used(authctxt, key))
923: break;
924: if (match_pattern_list(sshkey_ssh_name(key),
925: options.hostbased_key_types, 0) != 1)
926: break;
927: allowed = hostbased_key_allowed(authctxt->pw,
1.1 provos 928: cuser, chost, key);
1.172 djm 929: auth2_record_info(authctxt,
1.126 djm 930: "client user \"%.100s\", client host \"%.100s\"",
931: cuser, chost);
1.1 provos 932: break;
933: default:
1.14 markus 934: fatal("%s: unknown key type %d", __func__, type);
1.1 provos 935: break;
936: }
1.33 markus 937: }
1.161 djm 938:
1.180 djm 939: debug3("%s: %s authentication%s: %s key is %s", __func__,
940: auth_method, pubkey_auth_attempt ? "" : " test",
941: (key == NULL || !authctxt->valid) ? "invalid" : sshkey_type(key),
942: allowed ? "allowed" : "not allowed");
1.161 djm 943:
1.172 djm 944: auth2_record_key(authctxt, 0, key);
1.1 provos 945:
946: /* clear temporarily storage (used by verify) */
947: monitor_reset_key_state();
948:
949: if (allowed) {
950: /* Save temporarily for comparison in verify */
1.183 markus 951: if ((r = sshkey_to_blob(key, &key_blob, &key_bloblen)) != 0)
952: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 953: key_blobtype = type;
1.180 djm 954: key_opts = opts;
1.1 provos 955: hostbased_cuser = cuser;
956: hostbased_chost = chost;
1.72 djm 957: } else {
1.77 dtucker 958: /* Log failed attempt */
1.125 djm 959: auth_log(authctxt, 0, 0, auth_method, NULL);
1.124 djm 960: free(cuser);
961: free(chost);
1.1 provos 962: }
1.183 markus 963: sshkey_free(key);
1.1 provos 964:
1.183 markus 965: sshbuf_reset(m);
966: if ((r = sshbuf_put_u32(m, allowed)) != 0)
967: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.180 djm 968: if (opts != NULL && (r = sshauthopt_serialise(opts, m, 1)) != 0)
969: fatal("%s: sshauthopt_serialise: %s", __func__, ssh_err(r));
970: mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
1.1 provos 971:
1.180 djm 972: if (!allowed)
973: sshauthopt_free(opts);
1.1 provos 974:
975: return (0);
976: }
977:
978: static int
979: monitor_valid_userblob(u_char *data, u_int datalen)
980: {
1.183 markus 981: struct sshbuf *b;
982: const u_char *p;
1.159 djm 983: char *userstyle, *cp;
1.183 markus 984: size_t len;
985: u_char type;
986: int r, fail = 0;
1.1 provos 987:
1.183 markus 988: if ((b = sshbuf_new()) == NULL)
989: fatal("%s: sshbuf_new", __func__);
990: if ((r = sshbuf_put(b, data, datalen)) != 0)
991: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.3 markus 992:
1.1 provos 993: if (datafellows & SSH_OLD_SESSIONID) {
1.183 markus 994: p = sshbuf_ptr(b);
995: len = sshbuf_len(b);
1.13 markus 996: if ((session_id2 == NULL) ||
997: (len < session_id2_len) ||
1.108 djm 998: (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1.13 markus 999: fail++;
1.183 markus 1000: if ((r = sshbuf_consume(b, session_id2_len)) != 0)
1001: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 1002: } else {
1.183 markus 1003: if ((r = sshbuf_get_string_direct(b, &p, &len)) != 0)
1004: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.13 markus 1005: if ((session_id2 == NULL) ||
1006: (len != session_id2_len) ||
1.108 djm 1007: (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1.1 provos 1008: fail++;
1009: }
1.183 markus 1010: if ((r = sshbuf_get_u8(b, &type)) != 0)
1011: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1012: if (type != SSH2_MSG_USERAUTH_REQUEST)
1.1 provos 1013: fail++;
1.183 markus 1014: if ((r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
1015: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.121 djm 1016: xasprintf(&userstyle, "%s%s%s", authctxt->user,
1017: authctxt->style ? ":" : "",
1018: authctxt->style ? authctxt->style : "");
1.159 djm 1019: if (strcmp(userstyle, cp) != 0) {
1020: logit("wrong user name passed to monitor: "
1021: "expected %s != %.100s", userstyle, cp);
1.1 provos 1022: fail++;
1023: }
1.124 djm 1024: free(userstyle);
1.159 djm 1025: free(cp);
1.183 markus 1026: if ((r = sshbuf_skip_string(b)) != 0 || /* service */
1027: (r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
1028: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.178 djm 1029: if (strcmp("publickey", cp) != 0)
1030: fail++;
1031: free(cp);
1.183 markus 1032: if ((r = sshbuf_get_u8(b, &type)) != 0)
1033: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1034: if (type == 0)
1.178 djm 1035: fail++;
1.183 markus 1036: if ((r = sshbuf_skip_string(b)) != 0 || /* pkalg */
1037: (r = sshbuf_skip_string(b)) != 0) /* pkblob */
1038: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1039: if (sshbuf_len(b) != 0)
1.1 provos 1040: fail++;
1.183 markus 1041: sshbuf_free(b);
1.1 provos 1042: return (fail == 0);
1043: }
1044:
1045: static int
1.26 markus 1046: monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1047: char *chost)
1.1 provos 1048: {
1.183 markus 1049: struct sshbuf *b;
1050: const u_char *p;
1051: char *cp, *userstyle;
1052: size_t len;
1053: int r, fail = 0;
1054: u_char type;
1.1 provos 1055:
1.183 markus 1056: if ((b = sshbuf_new()) == NULL)
1057: fatal("%s: sshbuf_new", __func__);
1058: if ((r = sshbuf_put(b, data, datalen)) != 0 ||
1059: (r = sshbuf_get_string_direct(b, &p, &len)) != 0)
1060: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.3 markus 1061:
1.13 markus 1062: if ((session_id2 == NULL) ||
1063: (len != session_id2_len) ||
1.108 djm 1064: (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1.1 provos 1065: fail++;
1.13 markus 1066:
1.183 markus 1067: if ((r = sshbuf_get_u8(b, &type)) != 0)
1068: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1069: if (type != SSH2_MSG_USERAUTH_REQUEST)
1.1 provos 1070: fail++;
1.183 markus 1071: if ((r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
1072: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.121 djm 1073: xasprintf(&userstyle, "%s%s%s", authctxt->user,
1074: authctxt->style ? ":" : "",
1075: authctxt->style ? authctxt->style : "");
1.183 markus 1076: if (strcmp(userstyle, cp) != 0) {
1077: logit("wrong user name passed to monitor: "
1078: "expected %s != %.100s", userstyle, cp);
1.1 provos 1079: fail++;
1080: }
1.121 djm 1081: free(userstyle);
1.183 markus 1082: free(cp);
1083: if ((r = sshbuf_skip_string(b)) != 0 || /* service */
1084: (r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
1085: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1086: if (strcmp(cp, "hostbased") != 0)
1.1 provos 1087: fail++;
1.183 markus 1088: free(cp);
1089: if ((r = sshbuf_skip_string(b)) != 0 || /* pkalg */
1090: (r = sshbuf_skip_string(b)) != 0) /* pkblob */
1091: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 1092:
1093: /* verify client host, strip trailing dot if necessary */
1.183 markus 1094: if ((r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
1095: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1096: if (((len = strlen(cp)) > 0) && cp[len - 1] == '.')
1097: cp[len - 1] = '\0';
1098: if (strcmp(cp, chost) != 0)
1.1 provos 1099: fail++;
1.183 markus 1100: free(cp);
1.1 provos 1101:
1102: /* verify client user */
1.183 markus 1103: if ((r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
1104: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1105: if (strcmp(cp, cuser) != 0)
1.1 provos 1106: fail++;
1.183 markus 1107: free(cp);
1.1 provos 1108:
1.183 markus 1109: if (sshbuf_len(b) != 0)
1.1 provos 1110: fail++;
1.183 markus 1111: sshbuf_free(b);
1.1 provos 1112: return (fail == 0);
1113: }
1114:
1115: int
1.169 markus 1116: mm_answer_keyverify(int sock, struct sshbuf *m)
1.1 provos 1117: {
1.180 djm 1118: struct ssh *ssh = active_state; /* XXX */
1.168 markus 1119: struct sshkey *key;
1.1 provos 1120: u_char *signature, *data, *blob;
1.176 djm 1121: char *sigalg;
1.169 markus 1122: size_t signaturelen, datalen, bloblen;
1123: int r, ret, valid_data = 0, encoded_ret;
1.1 provos 1124:
1.169 markus 1125: if ((r = sshbuf_get_string(m, &blob, &bloblen)) != 0 ||
1126: (r = sshbuf_get_string(m, &signature, &signaturelen)) != 0 ||
1.176 djm 1127: (r = sshbuf_get_string(m, &data, &datalen)) != 0 ||
1128: (r = sshbuf_get_cstring(m, &sigalg, NULL)) != 0)
1.169 markus 1129: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 1130:
1131: if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1.8 mouring 1132: !monitor_allowed_key(blob, bloblen))
1.14 markus 1133: fatal("%s: bad key, not previously allowed", __func__);
1.1 provos 1134:
1.177 djm 1135: /* Empty signature algorithm means NULL. */
1136: if (*sigalg == '\0') {
1137: free(sigalg);
1138: sigalg = NULL;
1139: }
1140:
1.169 markus 1141: /* XXX use sshkey_froms here; need to change key_blob, etc. */
1142: if ((r = sshkey_from_blob(blob, bloblen, &key)) != 0)
1143: fatal("%s: bad public key blob: %s", __func__, ssh_err(r));
1.1 provos 1144:
1145: switch (key_blobtype) {
1146: case MM_USERKEY:
1147: valid_data = monitor_valid_userblob(data, datalen);
1.172 djm 1148: auth_method = "publickey";
1.1 provos 1149: break;
1150: case MM_HOSTKEY:
1151: valid_data = monitor_valid_hostbasedblob(data, datalen,
1152: hostbased_cuser, hostbased_chost);
1.172 djm 1153: auth_method = "hostbased";
1.1 provos 1154: break;
1155: default:
1156: valid_data = 0;
1157: break;
1158: }
1159: if (!valid_data)
1.14 markus 1160: fatal("%s: bad signature data blob", __func__);
1.1 provos 1161:
1.169 markus 1162: ret = sshkey_verify(key, signature, signaturelen, data, datalen,
1.176 djm 1163: sigalg, active_state->compat);
1.172 djm 1164: debug3("%s: %s %p signature %s", __func__, auth_method, key,
1165: (ret == 0) ? "verified" : "unverified");
1166: auth2_record_key(authctxt, ret == 0, key);
1.136 djm 1167:
1.124 djm 1168: free(blob);
1169: free(signature);
1170: free(data);
1.177 djm 1171: free(sigalg);
1.1 provos 1172:
1.180 djm 1173: if (key_blobtype == MM_USERKEY)
1174: auth_activate_options(ssh, key_opts);
1.1 provos 1175: monitor_reset_key_state();
1.3 markus 1176:
1.172 djm 1177: sshkey_free(key);
1.169 markus 1178: sshbuf_reset(m);
1179:
1180: /* encode ret != 0 as positive integer, since we're sending u32 */
1181: encoded_ret = (ret != 0);
1182: if ((r = sshbuf_put_u32(m, encoded_ret)) != 0)
1183: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.59 avsm 1184: mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
1.1 provos 1185:
1.169 markus 1186: return ret == 0;
1.1 provos 1187: }
1188:
1.2 markus 1189: static void
1.1 provos 1190: mm_record_login(Session *s, struct passwd *pw)
1191: {
1.158 djm 1192: struct ssh *ssh = active_state; /* XXX */
1.1 provos 1193: socklen_t fromlen;
1194: struct sockaddr_storage from;
1195:
1196: /*
1197: * Get IP address of client. If the connection is not a socket, let
1198: * the address be 0.0.0.0.
1199: */
1200: memset(&from, 0, sizeof(from));
1.24 stevesk 1201: fromlen = sizeof(from);
1.1 provos 1202: if (packet_connection_is_on_socket()) {
1203: if (getpeername(packet_get_connection_in(),
1.74 deraadt 1204: (struct sockaddr *)&from, &fromlen) < 0) {
1.1 provos 1205: debug("getpeername: %.100s", strerror(errno));
1.50 markus 1206: cleanup_exit(255);
1.1 provos 1207: }
1208: }
1209: /* Record that there was a login on that tty from the remote host. */
1210: record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1.158 djm 1211: session_get_remote_name_or_ip(ssh, utmp_len, options.use_dns),
1.24 stevesk 1212: (struct sockaddr *)&from, fromlen);
1.1 provos 1213: }
1214:
1215: static void
1216: mm_session_close(Session *s)
1217: {
1.41 djm 1218: debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
1.1 provos 1219: if (s->ttyfd != -1) {
1.86 stevesk 1220: debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1.1 provos 1221: session_pty_cleanup2(s);
1222: }
1.96 djm 1223: session_unused(s->self);
1.1 provos 1224: }
1225:
1226: int
1.183 markus 1227: mm_answer_pty(int sock, struct sshbuf *m)
1.1 provos 1228: {
1.11 mouring 1229: extern struct monitor *pmonitor;
1.1 provos 1230: Session *s;
1.183 markus 1231: int r, res, fd0;
1.1 provos 1232:
1.14 markus 1233: debug3("%s entering", __func__);
1.1 provos 1234:
1.183 markus 1235: sshbuf_reset(m);
1.1 provos 1236: s = session_new();
1237: if (s == NULL)
1238: goto error;
1239: s->authctxt = authctxt;
1240: s->pw = authctxt->pw;
1.11 mouring 1241: s->pid = pmonitor->m_pid;
1.1 provos 1242: res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1243: if (res == 0)
1244: goto error;
1245: pty_setowner(authctxt->pw, s->tty);
1246:
1.183 markus 1247: if ((r = sshbuf_put_u32(m, 1)) != 0 ||
1248: (r = sshbuf_put_cstring(m, s->tty)) != 0)
1249: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 1250:
1251: /* We need to trick ttyslot */
1252: if (dup2(s->ttyfd, 0) == -1)
1.14 markus 1253: fatal("%s: dup2", __func__);
1.1 provos 1254:
1255: mm_record_login(s, authctxt->pw);
1256:
1257: /* Now we can close the file descriptor again */
1258: close(0);
1.61 dtucker 1259:
1260: /* send messages generated by record_login */
1.183 markus 1261: if ((r = sshbuf_put_stringb(m, loginmsg)) != 0)
1262: fatal("%s: put login message: %s", __func__, ssh_err(r));
1263: sshbuf_reset(loginmsg);
1.61 dtucker 1264:
1265: mm_request_send(sock, MONITOR_ANS_PTY, m);
1266:
1.92 djm 1267: if (mm_send_fd(sock, s->ptyfd) == -1 ||
1268: mm_send_fd(sock, s->ttyfd) == -1)
1269: fatal("%s: send fds failed", __func__);
1.1 provos 1270:
1271: /* make sure nothing uses fd 0 */
1272: if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1.14 markus 1273: fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
1.1 provos 1274: if (fd0 != 0)
1.14 markus 1275: error("%s: fd0 %d != 0", __func__, fd0);
1.1 provos 1276:
1277: /* slave is not needed */
1278: close(s->ttyfd);
1279: s->ttyfd = s->ptyfd;
1280: /* no need to dup() because nobody closes ptyfd */
1281: s->ptymaster = s->ptyfd;
1282:
1.86 stevesk 1283: debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
1.1 provos 1284:
1285: return (0);
1286:
1287: error:
1288: if (s != NULL)
1289: mm_session_close(s);
1.183 markus 1290: if ((r = sshbuf_put_u32(m, 0)) != 0)
1291: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.59 avsm 1292: mm_request_send(sock, MONITOR_ANS_PTY, m);
1.1 provos 1293: return (0);
1294: }
1295:
1296: int
1.183 markus 1297: mm_answer_pty_cleanup(int sock, struct sshbuf *m)
1.1 provos 1298: {
1299: Session *s;
1300: char *tty;
1.183 markus 1301: int r;
1.1 provos 1302:
1.14 markus 1303: debug3("%s entering", __func__);
1.1 provos 1304:
1.183 markus 1305: if ((r = sshbuf_get_cstring(m, &tty, NULL)) != 0)
1306: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 1307: if ((s = session_by_tty(tty)) != NULL)
1308: mm_session_close(s);
1.183 markus 1309: sshbuf_reset(m);
1.124 djm 1310: free(tty);
1.1 provos 1311: return (0);
1312: }
1313:
1314: int
1.183 markus 1315: mm_answer_term(int sock, struct sshbuf *req)
1.1 provos 1316: {
1.173 djm 1317: struct ssh *ssh = active_state; /* XXX */
1.11 mouring 1318: extern struct monitor *pmonitor;
1.1 provos 1319: int res, status;
1320:
1.14 markus 1321: debug3("%s: tearing down sessions", __func__);
1.1 provos 1322:
1323: /* The child is terminating */
1.173 djm 1324: session_destroy_all(ssh, &mm_session_close);
1.1 provos 1325:
1.11 mouring 1326: while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1.9 markus 1327: if (errno != EINTR)
1328: exit(1);
1.1 provos 1329:
1330: res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1331:
1332: /* Terminate process */
1.57 deraadt 1333: exit(res);
1.170 markus 1334: }
1335:
1336: void
1337: monitor_clear_keystate(struct monitor *pmonitor)
1338: {
1339: struct ssh *ssh = active_state; /* XXX */
1340:
1341: ssh_clear_newkeys(ssh, MODE_IN);
1342: ssh_clear_newkeys(ssh, MODE_OUT);
1343: sshbuf_free(child_state);
1344: child_state = NULL;
1.1 provos 1345: }
1346:
1347: void
1.11 mouring 1348: monitor_apply_keystate(struct monitor *pmonitor)
1.1 provos 1349: {
1.139 markus 1350: struct ssh *ssh = active_state; /* XXX */
1351: struct kex *kex;
1352: int r;
1353:
1354: debug3("%s: packet_set_state", __func__);
1355: if ((r = ssh_packet_set_state(ssh, child_state)) != 0)
1356: fatal("%s: packet_set_state: %s", __func__, ssh_err(r));
1357: sshbuf_free(child_state);
1358: child_state = NULL;
1359:
1.154 mmcc 1360: if ((kex = ssh->kex) != NULL) {
1.139 markus 1361: /* XXX set callbacks */
1.147 djm 1362: #ifdef WITH_OPENSSL
1.139 markus 1363: kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1364: kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
1.160 djm 1365: kex->kex[KEX_DH_GRP14_SHA256] = kexdh_server;
1366: kex->kex[KEX_DH_GRP16_SHA512] = kexdh_server;
1367: kex->kex[KEX_DH_GRP18_SHA512] = kexdh_server;
1.139 markus 1368: kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
1369: kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
1370: kex->kex[KEX_ECDH_SHA2] = kexecdh_server;
1.147 djm 1371: #endif
1.139 markus 1372: kex->kex[KEX_C25519_SHA256] = kexc25519_server;
1373: kex->load_host_public_key=&get_hostkey_public_by_type;
1374: kex->load_host_private_key=&get_hostkey_private_by_type;
1375: kex->host_key_index=&get_hostkey_index;
1376: kex->sign = sshd_hostkey_sign;
1377: }
1.1 provos 1378: }
1379:
1380: /* This function requries careful sanity checking */
1381:
1382: void
1.11 mouring 1383: mm_get_keystate(struct monitor *pmonitor)
1.1 provos 1384: {
1.14 markus 1385: debug3("%s: Waiting for new keys", __func__);
1.1 provos 1386:
1.139 markus 1387: if ((child_state = sshbuf_new()) == NULL)
1388: fatal("%s: sshbuf_new failed", __func__);
1389: mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT,
1390: child_state);
1391: debug3("%s: GOT new keys", __func__);
1.1 provos 1392: }
1393:
1394:
1395: /* XXX */
1396:
1397: #define FD_CLOSEONEXEC(x) do { \
1.111 djm 1398: if (fcntl(x, F_SETFD, FD_CLOEXEC) == -1) \
1.1 provos 1399: fatal("fcntl(%d, F_SETFD)", x); \
1400: } while (0)
1401:
1.2 markus 1402: static void
1.114 djm 1403: monitor_openfds(struct monitor *mon, int do_logfds)
1.3 markus 1404: {
1.114 djm 1405: int pair[2];
1.171 markus 1406: #ifdef SO_ZEROIZE
1407: int on = 1;
1408: #endif
1.114 djm 1409:
1.1 provos 1410: if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1.114 djm 1411: fatal("%s: socketpair: %s", __func__, strerror(errno));
1.171 markus 1412: #ifdef SO_ZEROIZE
1413: if (setsockopt(pair[0], SOL_SOCKET, SO_ZEROIZE, &on, sizeof(on)) < 0)
1414: error("setsockopt SO_ZEROIZE(0): %.100s", strerror(errno));
1415: if (setsockopt(pair[1], SOL_SOCKET, SO_ZEROIZE, &on, sizeof(on)) < 0)
1416: error("setsockopt SO_ZEROIZE(1): %.100s", strerror(errno));
1417: #endif
1.1 provos 1418: FD_CLOSEONEXEC(pair[0]);
1419: FD_CLOSEONEXEC(pair[1]);
1.114 djm 1420: mon->m_recvfd = pair[0];
1421: mon->m_sendfd = pair[1];
1422:
1423: if (do_logfds) {
1424: if (pipe(pair) == -1)
1425: fatal("%s: pipe: %s", __func__, strerror(errno));
1426: FD_CLOSEONEXEC(pair[0]);
1427: FD_CLOSEONEXEC(pair[1]);
1428: mon->m_log_recvfd = pair[0];
1429: mon->m_log_sendfd = pair[1];
1430: } else
1431: mon->m_log_recvfd = mon->m_log_sendfd = -1;
1.1 provos 1432: }
1433:
1434: #define MM_MEMSIZE 65536
1435:
1436: struct monitor *
1437: monitor_init(void)
1438: {
1439: struct monitor *mon;
1440:
1.75 djm 1441: mon = xcalloc(1, sizeof(*mon));
1.114 djm 1442: monitor_openfds(mon, 1);
1.1 provos 1443:
1444: return mon;
1445: }
1446:
1447: void
1448: monitor_reinit(struct monitor *mon)
1449: {
1.114 djm 1450: monitor_openfds(mon, 0);
1.1 provos 1451: }
1.46 markus 1452:
1453: #ifdef GSSAPI
1454: int
1.183 markus 1455: mm_answer_gss_setup_ctx(int sock, struct sshbuf *m)
1.46 markus 1456: {
1.59 avsm 1457: gss_OID_desc goid;
1.46 markus 1458: OM_uint32 major;
1.183 markus 1459: size_t len;
1.184 djm 1460: u_char *p;
1.183 markus 1461: int r;
1.46 markus 1462:
1.164 djm 1463: if (!options.gss_authentication)
1464: fatal("%s: GSSAPI authentication not enabled", __func__);
1465:
1.184 djm 1466: if ((r = sshbuf_get_string(m, &p, &len)) != 0)
1.183 markus 1467: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.184 djm 1468: goid.elements = p;
1.59 avsm 1469: goid.length = len;
1.46 markus 1470:
1.59 avsm 1471: major = ssh_gssapi_server_ctx(&gsscontext, &goid);
1.46 markus 1472:
1.124 djm 1473: free(goid.elements);
1.46 markus 1474:
1.183 markus 1475: sshbuf_reset(m);
1476: if ((r = sshbuf_put_u32(m, major)) != 0)
1477: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.46 markus 1478:
1.64 stevesk 1479: mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
1.46 markus 1480:
1481: /* Now we have a context, enable the step */
1482: monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1483:
1484: return (0);
1485: }
1486:
1487: int
1.183 markus 1488: mm_answer_gss_accept_ctx(int sock, struct sshbuf *m)
1.46 markus 1489: {
1490: gss_buffer_desc in;
1491: gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
1.64 stevesk 1492: OM_uint32 major, minor;
1.46 markus 1493: OM_uint32 flags = 0; /* GSI needs this */
1.183 markus 1494: int r;
1.46 markus 1495:
1.164 djm 1496: if (!options.gss_authentication)
1497: fatal("%s: GSSAPI authentication not enabled", __func__);
1498:
1.184 djm 1499: if ((r = ssh_gssapi_get_buffer_desc(m, &in)) != 0)
1.183 markus 1500: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.46 markus 1501: major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1.124 djm 1502: free(in.value);
1.46 markus 1503:
1.183 markus 1504: sshbuf_reset(m);
1505: if ((r = sshbuf_put_u32(m, major)) != 0 ||
1506: (r = sshbuf_put_string(m, out.value, out.length)) != 0 ||
1507: (r = sshbuf_put_u32(m, flags)) != 0)
1508: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.59 avsm 1509: mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
1.46 markus 1510:
1511: gss_release_buffer(&minor, &out);
1512:
1.64 stevesk 1513: if (major == GSS_S_COMPLETE) {
1.46 markus 1514: monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
1515: monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1.52 markus 1516: monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
1.46 markus 1517: }
1518: return (0);
1519: }
1520:
1521: int
1.183 markus 1522: mm_answer_gss_checkmic(int sock, struct sshbuf *m)
1.52 markus 1523: {
1524: gss_buffer_desc gssbuf, mic;
1525: OM_uint32 ret;
1.184 djm 1526: int r;
1.54 djm 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, &gssbuf)) != 0 ||
1532: (r = ssh_gssapi_get_buffer_desc(m, &mic)) != 0)
1.183 markus 1533: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.54 djm 1534:
1.52 markus 1535: ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
1.54 djm 1536:
1.124 djm 1537: free(gssbuf.value);
1538: free(mic.value);
1.54 djm 1539:
1.183 markus 1540: sshbuf_reset(m);
1541: if ((r = sshbuf_put_u32(m, ret)) != 0)
1542: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.54 djm 1543:
1.59 avsm 1544: mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
1.54 djm 1545:
1.52 markus 1546: if (!GSS_ERROR(ret))
1547: monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1.54 djm 1548:
1.52 markus 1549: return (0);
1550: }
1551:
1552: int
1.183 markus 1553: mm_answer_gss_userok(int sock, struct sshbuf *m)
1.46 markus 1554: {
1.184 djm 1555: int r, authenticated;
1.172 djm 1556: const char *displayname;
1.164 djm 1557:
1558: if (!options.gss_authentication)
1559: fatal("%s: GSSAPI authentication not enabled", __func__);
1.46 markus 1560:
1561: authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1562:
1.183 markus 1563: sshbuf_reset(m);
1564: if ((r = sshbuf_put_u32(m, authenticated)) != 0)
1565: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.46 markus 1566:
1567: debug3("%s: sending result %d", __func__, authenticated);
1.59 avsm 1568: mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
1.46 markus 1569:
1.64 stevesk 1570: auth_method = "gssapi-with-mic";
1.172 djm 1571:
1572: if ((displayname = ssh_gssapi_displayname()) != NULL)
1573: auth2_record_info(authctxt, "%s", displayname);
1.46 markus 1574:
1575: /* Monitor loop will terminate if authenticated */
1576: return (authenticated);
1577: }
1578: #endif /* GSSAPI */
1.100 djm 1579:
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