Annotation of src/usr.bin/ssh/monitor.c, Revision 1.183
1.183 ! markus 1: /* $OpenBSD: monitor.c,v 1.182 2018/07/09 21:35:50 markus Exp $ */
1.1 provos 2: /*
3: * Copyright 2002 Niels Provos <provos@citi.umich.edu>
4: * Copyright 2002 Markus Friedl <markus@openbsd.org>
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: *
16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26: */
27:
1.67 stevesk 28: #include <sys/types.h>
29: #include <sys/wait.h>
1.79 stevesk 30: #include <sys/socket.h>
1.85 deraadt 31: #include <sys/tree.h>
1.95 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"
1.85 deraadt 54: #include "key.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;
554: u_int keyid;
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 ||
561: (r = sshbuf_get_cstring(m, &alg, &alglen)) != 0)
1.138 djm 562: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.159 djm 563: if (keyid > INT_MAX)
564: fatal("%s: invalid key ID", __func__);
1.1 provos 565:
1.69 djm 566: /*
1.110 djm 567: * Supported KEX types use SHA1 (20 bytes), SHA256 (32 bytes),
568: * SHA384 (48 bytes) and SHA512 (64 bytes).
1.144 djm 569: *
570: * Otherwise, verify the signature request is for a hostkey
571: * proof.
572: *
573: * XXX perform similar check for KEX signature requests too?
574: * it's not trivial, since what is signed is the hash, rather
575: * than the full kex structure...
1.69 djm 576: */
1.144 djm 577: if (datlen != 20 && datlen != 32 && datlen != 48 && datlen != 64) {
578: /*
579: * Construct expected hostkey proof and compare it to what
580: * the client sent us.
581: */
582: if (session_id2_len == 0) /* hostkeys is never first */
583: fatal("%s: bad data length: %zu", __func__, datlen);
584: if ((key = get_hostkey_public_by_index(keyid, ssh)) == NULL)
585: fatal("%s: no hostkey for index %d", __func__, keyid);
586: if ((sigbuf = sshbuf_new()) == NULL)
587: fatal("%s: sshbuf_new", __func__);
1.145 djm 588: if ((r = sshbuf_put_cstring(sigbuf, proof_req)) != 0 ||
589: (r = sshbuf_put_string(sigbuf, session_id2,
1.152 jsg 590: session_id2_len)) != 0 ||
1.144 djm 591: (r = sshkey_puts(key, sigbuf)) != 0)
592: fatal("%s: couldn't prepare private key "
593: "proof buffer: %s", __func__, ssh_err(r));
594: if (datlen != sshbuf_len(sigbuf) ||
595: memcmp(p, sshbuf_ptr(sigbuf), sshbuf_len(sigbuf)) != 0)
596: fatal("%s: bad data length: %zu, hostkey proof len %zu",
597: __func__, datlen, sshbuf_len(sigbuf));
598: sshbuf_free(sigbuf);
599: is_proof = 1;
600: }
1.1 provos 601:
1.13 markus 602: /* save session id, it will be passed on the first call */
603: if (session_id2_len == 0) {
604: session_id2_len = datlen;
605: session_id2 = xmalloc(session_id2_len);
606: memcpy(session_id2, p, session_id2_len);
607: }
608:
1.127 markus 609: if ((key = get_hostkey_by_index(keyid)) != NULL) {
1.155 markus 610: if ((r = sshkey_sign(key, &signature, &siglen, p, datlen, alg,
1.138 djm 611: datafellows)) != 0)
612: fatal("%s: sshkey_sign failed: %s",
613: __func__, ssh_err(r));
1.144 djm 614: } else if ((key = get_hostkey_public_by_index(keyid, ssh)) != NULL &&
1.138 djm 615: auth_sock > 0) {
616: if ((r = ssh_agent_sign(auth_sock, key, &signature, &siglen,
1.155 markus 617: p, datlen, alg, datafellows)) != 0) {
1.138 djm 618: fatal("%s: ssh_agent_sign failed: %s",
619: __func__, ssh_err(r));
620: }
1.127 markus 621: } else
1.14 markus 622: fatal("%s: no hostkey from index %d", __func__, keyid);
1.1 provos 623:
1.144 djm 624: debug3("%s: %s signature %p(%zu)", __func__,
625: is_proof ? "KEX" : "hostkey proof", signature, siglen);
1.1 provos 626:
1.138 djm 627: sshbuf_reset(m);
628: if ((r = sshbuf_put_string(m, signature, siglen)) != 0)
629: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 630:
1.157 djm 631: free(alg);
1.124 djm 632: free(p);
633: free(signature);
1.1 provos 634:
1.59 avsm 635: mm_request_send(sock, MONITOR_ANS_SIGN, m);
1.1 provos 636:
637: /* Turn on permissions for getpwnam */
638: monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
639:
640: return (0);
641: }
642:
643: /* Retrieves the password entry and also checks if the user is permitted */
644:
645: int
1.183 ! markus 646: mm_answer_pwnamallow(int sock, struct sshbuf *m)
1.1 provos 647: {
1.167 djm 648: struct ssh *ssh = active_state; /* XXX */
1.60 dtucker 649: char *username;
1.1 provos 650: struct passwd *pwent;
1.183 ! markus 651: int r, allowed = 0;
1.113 djm 652: u_int i;
1.3 markus 653:
1.14 markus 654: debug3("%s", __func__);
1.1 provos 655:
656: if (authctxt->attempt++ != 0)
1.14 markus 657: fatal("%s: multiple attempts for getpwnam", __func__);
1.1 provos 658:
1.183 ! markus 659: if ((r = sshbuf_get_cstring(m, &username, NULL)) != 0)
! 660: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 661:
1.60 dtucker 662: pwent = getpwnamallow(username);
1.1 provos 663:
1.60 dtucker 664: authctxt->user = xstrdup(username);
665: setproctitle("%s [priv]", pwent ? username : "unknown");
1.124 djm 666: free(username);
1.1 provos 667:
1.183 ! markus 668: sshbuf_reset(m);
1.1 provos 669:
670: if (pwent == NULL) {
1.183 ! markus 671: if ((r = sshbuf_put_u8(m, 0)) != 0)
! 672: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.53 djm 673: authctxt->pw = fakepw();
1.1 provos 674: goto out;
675: }
676:
677: allowed = 1;
1.4 markus 678: authctxt->pw = pwent;
1.1 provos 679: authctxt->valid = 1;
680:
1.183 ! markus 681: /* XXX don't sent pwent to unpriv; send fake class/dir/shell too */
! 682: if ((r = sshbuf_put_u8(m, 1)) != 0 ||
! 683: (r = sshbuf_put_string(m, pwent, sizeof(*pwent))) != 0 ||
! 684: (r = sshbuf_put_cstring(m, pwent->pw_name)) != 0 ||
! 685: (r = sshbuf_put_cstring(m, "*")) != 0 ||
! 686: (r = sshbuf_put_cstring(m, pwent->pw_gecos)) != 0 ||
! 687: (r = sshbuf_put_cstring(m, pwent->pw_class)) != 0 ||
! 688: (r = sshbuf_put_cstring(m, pwent->pw_dir)) != 0 ||
! 689: (r = sshbuf_put_cstring(m, pwent->pw_shell)) != 0)
! 690: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.94 dtucker 691:
692: out:
1.167 djm 693: ssh_packet_set_log_preamble(ssh, "%suser %s",
694: authctxt->valid ? "authenticating" : "invalid ", authctxt->user);
1.183 ! markus 695: if ((r = sshbuf_put_string(m, &options, sizeof(options))) != 0)
! 696: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.112 djm 697:
698: #define M_CP_STROPT(x) do { \
1.183 ! markus 699: if (options.x != NULL) { \
! 700: if ((r = sshbuf_put_cstring(m, options.x)) != 0) \
! 701: fatal("%s: buffer error: %s", \
! 702: __func__, ssh_err(r)); \
! 703: } \
1.112 djm 704: } while (0)
1.113 djm 705: #define M_CP_STRARRAYOPT(x, nx) do { \
1.183 ! markus 706: for (i = 0; i < options.nx; i++) { \
! 707: if ((r = sshbuf_put_cstring(m, options.x[i])) != 0) \
! 708: fatal("%s: buffer error: %s", \
! 709: __func__, ssh_err(r)); \
! 710: } \
1.113 djm 711: } while (0)
1.112 djm 712: /* See comment in servconf.h */
713: COPY_MATCH_STRING_OPTS();
714: #undef M_CP_STROPT
1.113 djm 715: #undef M_CP_STRARRAYOPT
1.118 djm 716:
717: /* Create valid auth method lists */
1.162 markus 718: if (auth2_setup_methods_lists(authctxt) != 0) {
1.118 djm 719: /*
720: * The monitor will continue long enough to let the child
721: * run to it's packet_disconnect(), but it must not allow any
722: * authentication to succeed.
723: */
724: debug("%s: no valid authentication method lists", __func__);
725: }
726:
1.14 markus 727: debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
1.59 avsm 728: mm_request_send(sock, MONITOR_ANS_PWNAM, m);
1.1 provos 729:
1.162 markus 730: /* Allow service/style information on the auth context */
731: monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
732: monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
1.10 djm 733:
734: return (0);
735: }
736:
1.183 ! markus 737: int mm_answer_auth2_read_banner(int sock, struct sshbuf *m)
1.10 djm 738: {
739: char *banner;
1.183 ! markus 740: int r;
1.10 djm 741:
1.183 ! markus 742: sshbuf_reset(m);
1.10 djm 743: banner = auth2_read_banner();
1.183 ! markus 744: if ((r = sshbuf_put_cstring(m, banner != NULL ? banner : "")) != 0)
! 745: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.59 avsm 746: mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
1.124 djm 747: free(banner);
1.1 provos 748:
749: return (0);
750: }
751:
752: int
1.183 ! markus 753: mm_answer_authserv(int sock, struct sshbuf *m)
1.1 provos 754: {
1.183 ! markus 755: int r;
! 756:
1.1 provos 757: monitor_permit_authentications(1);
758:
1.183 ! markus 759: if ((r = sshbuf_get_cstring(m, &authctxt->service, NULL)) != 0 ||
! 760: (r = sshbuf_get_cstring(m, &authctxt->style, NULL)) != 0)
! 761: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.6 stevesk 762: debug3("%s: service=%s, style=%s",
1.14 markus 763: __func__, authctxt->service, authctxt->style);
1.6 stevesk 764:
1.1 provos 765: if (strlen(authctxt->style) == 0) {
1.124 djm 766: free(authctxt->style);
1.1 provos 767: authctxt->style = NULL;
768: }
769:
770: return (0);
771: }
772:
773: int
1.183 ! markus 774: mm_answer_authpassword(int sock, struct sshbuf *m)
1.1 provos 775: {
1.180 djm 776: struct ssh *ssh = active_state; /* XXX */
1.1 provos 777: static int call_count;
778: char *passwd;
1.183 ! markus 779: int r, authenticated;
! 780: size_t plen;
1.1 provos 781:
1.164 djm 782: if (!options.password_authentication)
783: fatal("%s: password authentication not enabled", __func__);
1.183 ! markus 784: if ((r = sshbuf_get_cstring(m, &passwd, &plen)) != 0)
! 785: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 786: /* Only authenticate if the context is valid */
1.12 markus 787: authenticated = options.password_authentication &&
1.180 djm 788: auth_password(ssh, passwd);
1.183 ! markus 789: explicit_bzero(passwd, plen);
1.124 djm 790: free(passwd);
1.1 provos 791:
1.183 ! markus 792: sshbuf_reset(m);
! 793: if ((r = sshbuf_put_u32(m, authenticated)) != 0)
! 794: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 795:
1.14 markus 796: debug3("%s: sending result %d", __func__, authenticated);
1.59 avsm 797: mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
1.1 provos 798:
799: call_count++;
800: if (plen == 0 && call_count == 1)
801: auth_method = "none";
802: else
803: auth_method = "password";
804:
805: /* Causes monitor loop to terminate if authenticated */
806: return (authenticated);
807: }
808:
809: int
1.183 ! markus 810: mm_answer_bsdauthquery(int sock, struct sshbuf *m)
1.1 provos 811: {
812: char *name, *infotxt;
1.183 ! markus 813: u_int numprompts, *echo_on, success;
1.1 provos 814: char **prompts;
1.183 ! markus 815: int r;
1.1 provos 816:
1.164 djm 817: if (!options.kbd_interactive_authentication)
818: fatal("%s: kbd-int authentication not enabled", __func__);
1.31 markus 819: success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
820: &prompts, &echo_on) < 0 ? 0 : 1;
1.1 provos 821:
1.183 ! markus 822: sshbuf_reset(m);
! 823: if ((r = sshbuf_put_u32(m, success)) != 0)
! 824: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 825: if (success) {
! 826: if ((r = sshbuf_put_cstring(m, prompts[0])) != 0)
! 827: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 828: }
1.1 provos 829:
1.31 markus 830: debug3("%s: sending challenge success: %u", __func__, success);
1.59 avsm 831: mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
1.1 provos 832:
1.31 markus 833: if (success) {
1.124 djm 834: free(name);
835: free(infotxt);
836: free(prompts);
837: free(echo_on);
1.1 provos 838: }
839:
840: return (0);
841: }
842:
843: int
1.183 ! markus 844: mm_answer_bsdauthrespond(int sock, struct sshbuf *m)
1.1 provos 845: {
846: char *response;
1.183 ! markus 847: int r, authok;
1.1 provos 848:
1.164 djm 849: if (!options.kbd_interactive_authentication)
850: fatal("%s: kbd-int authentication not enabled", __func__);
1.154 mmcc 851: if (authctxt->as == NULL)
1.14 markus 852: fatal("%s: no bsd auth session", __func__);
1.1 provos 853:
1.183 ! markus 854: if ((r = sshbuf_get_cstring(m, &response, NULL)) != 0)
! 855: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.12 markus 856: authok = options.challenge_response_authentication &&
857: auth_userresponse(authctxt->as, response, 0);
1.1 provos 858: authctxt->as = NULL;
1.14 markus 859: debug3("%s: <%s> = <%d>", __func__, response, authok);
1.124 djm 860: free(response);
1.1 provos 861:
1.183 ! markus 862: sshbuf_reset(m);
! 863: if ((r = sshbuf_put_u32(m, authok)) != 0)
! 864: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 865:
1.14 markus 866: debug3("%s: sending authenticated: %d", __func__, authok);
1.59 avsm 867: mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
1.1 provos 868:
1.162 markus 869: auth_method = "keyboard-interactive";
870: auth_submethod = "bsdauth";
1.1 provos 871:
872: return (authok != 0);
873: }
874:
875: int
1.183 ! markus 876: mm_answer_keyallowed(int sock, struct sshbuf *m)
1.1 provos 877: {
1.180 djm 878: struct ssh *ssh = active_state; /* XXX */
1.183 ! markus 879: struct sshkey *key = NULL;
1.26 markus 880: char *cuser, *chost;
1.183 ! markus 881: u_int pubkey_auth_attempt;
1.1 provos 882: enum mm_keytype type = 0;
1.180 djm 883: int r, allowed = 0;
884: struct sshauthopt *opts = NULL;
1.1 provos 885:
1.14 markus 886: debug3("%s entering", __func__);
1.183 ! markus 887: if ((r = sshbuf_get_u32(m, &type)) != 0 ||
! 888: (r = sshbuf_get_cstring(m, &cuser, NULL)) != 0 ||
! 889: (r = sshbuf_get_cstring(m, &chost, NULL)) != 0 ||
! 890: (r = sshkey_froms(m, &key)) != 0 ||
! 891: (r = sshbuf_get_u32(m, &pubkey_auth_attempt)) != 0)
! 892: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 893:
1.14 markus 894: debug3("%s: key_from_blob: %p", __func__, key);
1.1 provos 895:
1.51 djm 896: if (key != NULL && authctxt->valid) {
1.137 djm 897: /* These should not make it past the privsep child */
898: if (key_type_plain(key->type) == KEY_RSA &&
899: (datafellows & SSH_BUG_RSASIGMD5) != 0)
900: fatal("%s: passed a SSH_BUG_RSASIGMD5 key", __func__);
901:
1.63 deraadt 902: switch (type) {
1.1 provos 903: case MM_USERKEY:
1.77 dtucker 904: auth_method = "publickey";
1.180 djm 905: if (!options.pubkey_authentication)
906: break;
907: if (auth2_key_already_used(authctxt, key))
908: break;
909: if (match_pattern_list(sshkey_ssh_name(key),
910: options.pubkey_key_types, 0) != 1)
911: break;
912: allowed = user_key_allowed(ssh, authctxt->pw, key,
913: pubkey_auth_attempt, &opts);
1.1 provos 914: break;
915: case MM_HOSTKEY:
1.180 djm 916: auth_method = "hostbased";
917: if (!options.hostbased_authentication)
918: break;
919: if (auth2_key_already_used(authctxt, key))
920: break;
921: if (match_pattern_list(sshkey_ssh_name(key),
922: options.hostbased_key_types, 0) != 1)
923: break;
924: allowed = hostbased_key_allowed(authctxt->pw,
1.1 provos 925: cuser, chost, key);
1.172 djm 926: auth2_record_info(authctxt,
1.126 djm 927: "client user \"%.100s\", client host \"%.100s\"",
928: cuser, chost);
1.1 provos 929: break;
930: default:
1.14 markus 931: fatal("%s: unknown key type %d", __func__, type);
1.1 provos 932: break;
933: }
1.33 markus 934: }
1.161 djm 935:
1.180 djm 936: debug3("%s: %s authentication%s: %s key is %s", __func__,
937: auth_method, pubkey_auth_attempt ? "" : " test",
938: (key == NULL || !authctxt->valid) ? "invalid" : sshkey_type(key),
939: allowed ? "allowed" : "not allowed");
1.161 djm 940:
1.172 djm 941: auth2_record_key(authctxt, 0, key);
1.1 provos 942:
943: /* clear temporarily storage (used by verify) */
944: monitor_reset_key_state();
945:
946: if (allowed) {
947: /* Save temporarily for comparison in verify */
1.183 ! markus 948: if ((r = sshkey_to_blob(key, &key_blob, &key_bloblen)) != 0)
! 949: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 950: key_blobtype = type;
1.180 djm 951: key_opts = opts;
1.1 provos 952: hostbased_cuser = cuser;
953: hostbased_chost = chost;
1.72 djm 954: } else {
1.77 dtucker 955: /* Log failed attempt */
1.125 djm 956: auth_log(authctxt, 0, 0, auth_method, NULL);
1.124 djm 957: free(cuser);
958: free(chost);
1.1 provos 959: }
1.183 ! markus 960: sshkey_free(key);
1.1 provos 961:
1.183 ! markus 962: sshbuf_reset(m);
! 963: if ((r = sshbuf_put_u32(m, allowed)) != 0)
! 964: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.180 djm 965: if (opts != NULL && (r = sshauthopt_serialise(opts, m, 1)) != 0)
966: fatal("%s: sshauthopt_serialise: %s", __func__, ssh_err(r));
967: mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
1.1 provos 968:
1.180 djm 969: if (!allowed)
970: sshauthopt_free(opts);
1.1 provos 971:
972: return (0);
973: }
974:
975: static int
976: monitor_valid_userblob(u_char *data, u_int datalen)
977: {
1.183 ! markus 978: struct sshbuf *b;
! 979: const u_char *p;
1.159 djm 980: char *userstyle, *cp;
1.183 ! markus 981: size_t len;
! 982: u_char type;
! 983: int r, fail = 0;
1.1 provos 984:
1.183 ! markus 985: if ((b = sshbuf_new()) == NULL)
! 986: fatal("%s: sshbuf_new", __func__);
! 987: if ((r = sshbuf_put(b, data, datalen)) != 0)
! 988: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.3 markus 989:
1.1 provos 990: if (datafellows & SSH_OLD_SESSIONID) {
1.183 ! markus 991: p = sshbuf_ptr(b);
! 992: len = sshbuf_len(b);
1.13 markus 993: if ((session_id2 == NULL) ||
994: (len < session_id2_len) ||
1.108 djm 995: (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1.13 markus 996: fail++;
1.183 ! markus 997: if ((r = sshbuf_consume(b, session_id2_len)) != 0)
! 998: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 999: } else {
1.183 ! markus 1000: if ((r = sshbuf_get_string_direct(b, &p, &len)) != 0)
! 1001: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.13 markus 1002: if ((session_id2 == NULL) ||
1003: (len != session_id2_len) ||
1.108 djm 1004: (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1.1 provos 1005: fail++;
1006: }
1.183 ! markus 1007: if ((r = sshbuf_get_u8(b, &type)) != 0)
! 1008: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 1009: if (type != SSH2_MSG_USERAUTH_REQUEST)
1.1 provos 1010: fail++;
1.183 ! markus 1011: if ((r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
! 1012: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.121 djm 1013: xasprintf(&userstyle, "%s%s%s", authctxt->user,
1014: authctxt->style ? ":" : "",
1015: authctxt->style ? authctxt->style : "");
1.159 djm 1016: if (strcmp(userstyle, cp) != 0) {
1017: logit("wrong user name passed to monitor: "
1018: "expected %s != %.100s", userstyle, cp);
1.1 provos 1019: fail++;
1020: }
1.124 djm 1021: free(userstyle);
1.159 djm 1022: free(cp);
1.183 ! markus 1023: if ((r = sshbuf_skip_string(b)) != 0 || /* service */
! 1024: (r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
! 1025: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.178 djm 1026: if (strcmp("publickey", cp) != 0)
1027: fail++;
1028: free(cp);
1.183 ! markus 1029: if ((r = sshbuf_get_u8(b, &type)) != 0)
! 1030: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 1031: if (type == 0)
1.178 djm 1032: fail++;
1.183 ! markus 1033: if ((r = sshbuf_skip_string(b)) != 0 || /* pkalg */
! 1034: (r = sshbuf_skip_string(b)) != 0) /* pkblob */
! 1035: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 1036: if (sshbuf_len(b) != 0)
1.1 provos 1037: fail++;
1.183 ! markus 1038: sshbuf_free(b);
1.1 provos 1039: return (fail == 0);
1040: }
1041:
1042: static int
1.26 markus 1043: monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1044: char *chost)
1.1 provos 1045: {
1.183 ! markus 1046: struct sshbuf *b;
! 1047: const u_char *p;
! 1048: char *cp, *userstyle;
! 1049: size_t len;
! 1050: int r, fail = 0;
! 1051: u_char type;
1.1 provos 1052:
1.183 ! markus 1053: if ((b = sshbuf_new()) == NULL)
! 1054: fatal("%s: sshbuf_new", __func__);
! 1055: if ((r = sshbuf_put(b, data, datalen)) != 0 ||
! 1056: (r = sshbuf_get_string_direct(b, &p, &len)) != 0)
! 1057: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.3 markus 1058:
1.13 markus 1059: if ((session_id2 == NULL) ||
1060: (len != session_id2_len) ||
1.108 djm 1061: (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1.1 provos 1062: fail++;
1.13 markus 1063:
1.183 ! markus 1064: if ((r = sshbuf_get_u8(b, &type)) != 0)
! 1065: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 1066: if (type != SSH2_MSG_USERAUTH_REQUEST)
1.1 provos 1067: fail++;
1.183 ! markus 1068: if ((r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
! 1069: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.121 djm 1070: xasprintf(&userstyle, "%s%s%s", authctxt->user,
1071: authctxt->style ? ":" : "",
1072: authctxt->style ? authctxt->style : "");
1.183 ! markus 1073: if (strcmp(userstyle, cp) != 0) {
! 1074: logit("wrong user name passed to monitor: "
! 1075: "expected %s != %.100s", userstyle, cp);
1.1 provos 1076: fail++;
1077: }
1.121 djm 1078: free(userstyle);
1.183 ! markus 1079: free(cp);
! 1080: if ((r = sshbuf_skip_string(b)) != 0 || /* service */
! 1081: (r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
! 1082: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 1083: if (strcmp(cp, "hostbased") != 0)
1.1 provos 1084: fail++;
1.183 ! markus 1085: free(cp);
! 1086: if ((r = sshbuf_skip_string(b)) != 0 || /* pkalg */
! 1087: (r = sshbuf_skip_string(b)) != 0) /* pkblob */
! 1088: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 1089:
1090: /* verify client host, strip trailing dot if necessary */
1.183 ! markus 1091: if ((r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
! 1092: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 1093: if (((len = strlen(cp)) > 0) && cp[len - 1] == '.')
! 1094: cp[len - 1] = '\0';
! 1095: if (strcmp(cp, chost) != 0)
1.1 provos 1096: fail++;
1.183 ! markus 1097: free(cp);
1.1 provos 1098:
1099: /* verify client user */
1.183 ! markus 1100: if ((r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
! 1101: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 1102: if (strcmp(cp, cuser) != 0)
1.1 provos 1103: fail++;
1.183 ! markus 1104: free(cp);
1.1 provos 1105:
1.183 ! markus 1106: if (sshbuf_len(b) != 0)
1.1 provos 1107: fail++;
1.183 ! markus 1108: sshbuf_free(b);
1.1 provos 1109: return (fail == 0);
1110: }
1111:
1112: int
1.169 markus 1113: mm_answer_keyverify(int sock, struct sshbuf *m)
1.1 provos 1114: {
1.180 djm 1115: struct ssh *ssh = active_state; /* XXX */
1.168 markus 1116: struct sshkey *key;
1.1 provos 1117: u_char *signature, *data, *blob;
1.176 djm 1118: char *sigalg;
1.169 markus 1119: size_t signaturelen, datalen, bloblen;
1120: int r, ret, valid_data = 0, encoded_ret;
1.1 provos 1121:
1.169 markus 1122: if ((r = sshbuf_get_string(m, &blob, &bloblen)) != 0 ||
1123: (r = sshbuf_get_string(m, &signature, &signaturelen)) != 0 ||
1.176 djm 1124: (r = sshbuf_get_string(m, &data, &datalen)) != 0 ||
1125: (r = sshbuf_get_cstring(m, &sigalg, NULL)) != 0)
1.169 markus 1126: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 1127:
1128: if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1.8 mouring 1129: !monitor_allowed_key(blob, bloblen))
1.14 markus 1130: fatal("%s: bad key, not previously allowed", __func__);
1.1 provos 1131:
1.177 djm 1132: /* Empty signature algorithm means NULL. */
1133: if (*sigalg == '\0') {
1134: free(sigalg);
1135: sigalg = NULL;
1136: }
1137:
1.169 markus 1138: /* XXX use sshkey_froms here; need to change key_blob, etc. */
1139: if ((r = sshkey_from_blob(blob, bloblen, &key)) != 0)
1140: fatal("%s: bad public key blob: %s", __func__, ssh_err(r));
1.1 provos 1141:
1142: switch (key_blobtype) {
1143: case MM_USERKEY:
1144: valid_data = monitor_valid_userblob(data, datalen);
1.172 djm 1145: auth_method = "publickey";
1.1 provos 1146: break;
1147: case MM_HOSTKEY:
1148: valid_data = monitor_valid_hostbasedblob(data, datalen,
1149: hostbased_cuser, hostbased_chost);
1.172 djm 1150: auth_method = "hostbased";
1.1 provos 1151: break;
1152: default:
1153: valid_data = 0;
1154: break;
1155: }
1156: if (!valid_data)
1.14 markus 1157: fatal("%s: bad signature data blob", __func__);
1.1 provos 1158:
1.169 markus 1159: ret = sshkey_verify(key, signature, signaturelen, data, datalen,
1.176 djm 1160: sigalg, active_state->compat);
1.172 djm 1161: debug3("%s: %s %p signature %s", __func__, auth_method, key,
1162: (ret == 0) ? "verified" : "unverified");
1163: auth2_record_key(authctxt, ret == 0, key);
1.136 djm 1164:
1.124 djm 1165: free(blob);
1166: free(signature);
1167: free(data);
1.177 djm 1168: free(sigalg);
1.1 provos 1169:
1.180 djm 1170: if (key_blobtype == MM_USERKEY)
1171: auth_activate_options(ssh, key_opts);
1.1 provos 1172: monitor_reset_key_state();
1.3 markus 1173:
1.172 djm 1174: sshkey_free(key);
1.169 markus 1175: sshbuf_reset(m);
1176:
1177: /* encode ret != 0 as positive integer, since we're sending u32 */
1178: encoded_ret = (ret != 0);
1179: if ((r = sshbuf_put_u32(m, encoded_ret)) != 0)
1180: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.59 avsm 1181: mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
1.1 provos 1182:
1.169 markus 1183: return ret == 0;
1.1 provos 1184: }
1185:
1.2 markus 1186: static void
1.1 provos 1187: mm_record_login(Session *s, struct passwd *pw)
1188: {
1.158 djm 1189: struct ssh *ssh = active_state; /* XXX */
1.1 provos 1190: socklen_t fromlen;
1191: struct sockaddr_storage from;
1192:
1193: /*
1194: * Get IP address of client. If the connection is not a socket, let
1195: * the address be 0.0.0.0.
1196: */
1197: memset(&from, 0, sizeof(from));
1.24 stevesk 1198: fromlen = sizeof(from);
1.1 provos 1199: if (packet_connection_is_on_socket()) {
1200: if (getpeername(packet_get_connection_in(),
1.74 deraadt 1201: (struct sockaddr *)&from, &fromlen) < 0) {
1.1 provos 1202: debug("getpeername: %.100s", strerror(errno));
1.50 markus 1203: cleanup_exit(255);
1.1 provos 1204: }
1205: }
1206: /* Record that there was a login on that tty from the remote host. */
1207: record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1.158 djm 1208: session_get_remote_name_or_ip(ssh, utmp_len, options.use_dns),
1.24 stevesk 1209: (struct sockaddr *)&from, fromlen);
1.1 provos 1210: }
1211:
1212: static void
1213: mm_session_close(Session *s)
1214: {
1.41 djm 1215: debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
1.1 provos 1216: if (s->ttyfd != -1) {
1.86 stevesk 1217: debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1.1 provos 1218: session_pty_cleanup2(s);
1219: }
1.96 djm 1220: session_unused(s->self);
1.1 provos 1221: }
1222:
1223: int
1.183 ! markus 1224: mm_answer_pty(int sock, struct sshbuf *m)
1.1 provos 1225: {
1.11 mouring 1226: extern struct monitor *pmonitor;
1.1 provos 1227: Session *s;
1.183 ! markus 1228: int r, res, fd0;
1.1 provos 1229:
1.14 markus 1230: debug3("%s entering", __func__);
1.1 provos 1231:
1.183 ! markus 1232: sshbuf_reset(m);
1.1 provos 1233: s = session_new();
1234: if (s == NULL)
1235: goto error;
1236: s->authctxt = authctxt;
1237: s->pw = authctxt->pw;
1.11 mouring 1238: s->pid = pmonitor->m_pid;
1.1 provos 1239: res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1240: if (res == 0)
1241: goto error;
1242: pty_setowner(authctxt->pw, s->tty);
1243:
1.183 ! markus 1244: if ((r = sshbuf_put_u32(m, 1)) != 0 ||
! 1245: (r = sshbuf_put_cstring(m, s->tty)) != 0)
! 1246: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 1247:
1248: /* We need to trick ttyslot */
1249: if (dup2(s->ttyfd, 0) == -1)
1.14 markus 1250: fatal("%s: dup2", __func__);
1.1 provos 1251:
1252: mm_record_login(s, authctxt->pw);
1253:
1254: /* Now we can close the file descriptor again */
1255: close(0);
1.61 dtucker 1256:
1257: /* send messages generated by record_login */
1.183 ! markus 1258: if ((r = sshbuf_put_stringb(m, loginmsg)) != 0)
! 1259: fatal("%s: put login message: %s", __func__, ssh_err(r));
! 1260: sshbuf_reset(loginmsg);
1.61 dtucker 1261:
1262: mm_request_send(sock, MONITOR_ANS_PTY, m);
1263:
1.92 djm 1264: if (mm_send_fd(sock, s->ptyfd) == -1 ||
1265: mm_send_fd(sock, s->ttyfd) == -1)
1266: fatal("%s: send fds failed", __func__);
1.1 provos 1267:
1268: /* make sure nothing uses fd 0 */
1269: if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1.14 markus 1270: fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
1.1 provos 1271: if (fd0 != 0)
1.14 markus 1272: error("%s: fd0 %d != 0", __func__, fd0);
1.1 provos 1273:
1274: /* slave is not needed */
1275: close(s->ttyfd);
1276: s->ttyfd = s->ptyfd;
1277: /* no need to dup() because nobody closes ptyfd */
1278: s->ptymaster = s->ptyfd;
1279:
1.86 stevesk 1280: debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
1.1 provos 1281:
1282: return (0);
1283:
1284: error:
1285: if (s != NULL)
1286: mm_session_close(s);
1.183 ! markus 1287: if ((r = sshbuf_put_u32(m, 0)) != 0)
! 1288: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.59 avsm 1289: mm_request_send(sock, MONITOR_ANS_PTY, m);
1.1 provos 1290: return (0);
1291: }
1292:
1293: int
1.183 ! markus 1294: mm_answer_pty_cleanup(int sock, struct sshbuf *m)
1.1 provos 1295: {
1296: Session *s;
1297: char *tty;
1.183 ! markus 1298: int r;
1.1 provos 1299:
1.14 markus 1300: debug3("%s entering", __func__);
1.1 provos 1301:
1.183 ! markus 1302: if ((r = sshbuf_get_cstring(m, &tty, NULL)) != 0)
! 1303: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 1304: if ((s = session_by_tty(tty)) != NULL)
1305: mm_session_close(s);
1.183 ! markus 1306: sshbuf_reset(m);
1.124 djm 1307: free(tty);
1.1 provos 1308: return (0);
1309: }
1310:
1311: int
1.183 ! markus 1312: mm_answer_term(int sock, struct sshbuf *req)
1.1 provos 1313: {
1.173 djm 1314: struct ssh *ssh = active_state; /* XXX */
1.11 mouring 1315: extern struct monitor *pmonitor;
1.1 provos 1316: int res, status;
1317:
1.14 markus 1318: debug3("%s: tearing down sessions", __func__);
1.1 provos 1319:
1320: /* The child is terminating */
1.173 djm 1321: session_destroy_all(ssh, &mm_session_close);
1.1 provos 1322:
1.11 mouring 1323: while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1.9 markus 1324: if (errno != EINTR)
1325: exit(1);
1.1 provos 1326:
1327: res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1328:
1329: /* Terminate process */
1.57 deraadt 1330: exit(res);
1.170 markus 1331: }
1332:
1333: void
1334: monitor_clear_keystate(struct monitor *pmonitor)
1335: {
1336: struct ssh *ssh = active_state; /* XXX */
1337:
1338: ssh_clear_newkeys(ssh, MODE_IN);
1339: ssh_clear_newkeys(ssh, MODE_OUT);
1340: sshbuf_free(child_state);
1341: child_state = NULL;
1.1 provos 1342: }
1343:
1344: void
1.11 mouring 1345: monitor_apply_keystate(struct monitor *pmonitor)
1.1 provos 1346: {
1.139 markus 1347: struct ssh *ssh = active_state; /* XXX */
1348: struct kex *kex;
1349: int r;
1350:
1351: debug3("%s: packet_set_state", __func__);
1352: if ((r = ssh_packet_set_state(ssh, child_state)) != 0)
1353: fatal("%s: packet_set_state: %s", __func__, ssh_err(r));
1354: sshbuf_free(child_state);
1355: child_state = NULL;
1356:
1.154 mmcc 1357: if ((kex = ssh->kex) != NULL) {
1.139 markus 1358: /* XXX set callbacks */
1.147 djm 1359: #ifdef WITH_OPENSSL
1.139 markus 1360: kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1361: kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
1.160 djm 1362: kex->kex[KEX_DH_GRP14_SHA256] = kexdh_server;
1363: kex->kex[KEX_DH_GRP16_SHA512] = kexdh_server;
1364: kex->kex[KEX_DH_GRP18_SHA512] = kexdh_server;
1.139 markus 1365: kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
1366: kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
1367: kex->kex[KEX_ECDH_SHA2] = kexecdh_server;
1.147 djm 1368: #endif
1.139 markus 1369: kex->kex[KEX_C25519_SHA256] = kexc25519_server;
1370: kex->load_host_public_key=&get_hostkey_public_by_type;
1371: kex->load_host_private_key=&get_hostkey_private_by_type;
1372: kex->host_key_index=&get_hostkey_index;
1373: kex->sign = sshd_hostkey_sign;
1374: }
1.1 provos 1375: }
1376:
1377: /* This function requries careful sanity checking */
1378:
1379: void
1.11 mouring 1380: mm_get_keystate(struct monitor *pmonitor)
1.1 provos 1381: {
1.14 markus 1382: debug3("%s: Waiting for new keys", __func__);
1.1 provos 1383:
1.139 markus 1384: if ((child_state = sshbuf_new()) == NULL)
1385: fatal("%s: sshbuf_new failed", __func__);
1386: mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT,
1387: child_state);
1388: debug3("%s: GOT new keys", __func__);
1.1 provos 1389: }
1390:
1391:
1392: /* XXX */
1393:
1394: #define FD_CLOSEONEXEC(x) do { \
1.111 djm 1395: if (fcntl(x, F_SETFD, FD_CLOEXEC) == -1) \
1.1 provos 1396: fatal("fcntl(%d, F_SETFD)", x); \
1397: } while (0)
1398:
1.2 markus 1399: static void
1.114 djm 1400: monitor_openfds(struct monitor *mon, int do_logfds)
1.3 markus 1401: {
1.114 djm 1402: int pair[2];
1.171 markus 1403: #ifdef SO_ZEROIZE
1404: int on = 1;
1405: #endif
1.114 djm 1406:
1.1 provos 1407: if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1.114 djm 1408: fatal("%s: socketpair: %s", __func__, strerror(errno));
1.171 markus 1409: #ifdef SO_ZEROIZE
1410: if (setsockopt(pair[0], SOL_SOCKET, SO_ZEROIZE, &on, sizeof(on)) < 0)
1411: error("setsockopt SO_ZEROIZE(0): %.100s", strerror(errno));
1412: if (setsockopt(pair[1], SOL_SOCKET, SO_ZEROIZE, &on, sizeof(on)) < 0)
1413: error("setsockopt SO_ZEROIZE(1): %.100s", strerror(errno));
1414: #endif
1.1 provos 1415: FD_CLOSEONEXEC(pair[0]);
1416: FD_CLOSEONEXEC(pair[1]);
1.114 djm 1417: mon->m_recvfd = pair[0];
1418: mon->m_sendfd = pair[1];
1419:
1420: if (do_logfds) {
1421: if (pipe(pair) == -1)
1422: fatal("%s: pipe: %s", __func__, strerror(errno));
1423: FD_CLOSEONEXEC(pair[0]);
1424: FD_CLOSEONEXEC(pair[1]);
1425: mon->m_log_recvfd = pair[0];
1426: mon->m_log_sendfd = pair[1];
1427: } else
1428: mon->m_log_recvfd = mon->m_log_sendfd = -1;
1.1 provos 1429: }
1430:
1431: #define MM_MEMSIZE 65536
1432:
1433: struct monitor *
1434: monitor_init(void)
1435: {
1436: struct monitor *mon;
1437:
1.75 djm 1438: mon = xcalloc(1, sizeof(*mon));
1.114 djm 1439: monitor_openfds(mon, 1);
1.1 provos 1440:
1441: return mon;
1442: }
1443:
1444: void
1445: monitor_reinit(struct monitor *mon)
1446: {
1.114 djm 1447: monitor_openfds(mon, 0);
1.1 provos 1448: }
1.46 markus 1449:
1450: #ifdef GSSAPI
1451: int
1.183 ! markus 1452: mm_answer_gss_setup_ctx(int sock, struct sshbuf *m)
1.46 markus 1453: {
1.59 avsm 1454: gss_OID_desc goid;
1.46 markus 1455: OM_uint32 major;
1.183 ! markus 1456: size_t len;
! 1457: int r;
1.46 markus 1458:
1.164 djm 1459: if (!options.gss_authentication)
1460: fatal("%s: GSSAPI authentication not enabled", __func__);
1461:
1.183 ! markus 1462: if ((r = sshbuf_get_string(m, &goid.elements, &len)) != 0)
! 1463: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.59 avsm 1464: goid.length = len;
1.46 markus 1465:
1.59 avsm 1466: major = ssh_gssapi_server_ctx(&gsscontext, &goid);
1.46 markus 1467:
1.124 djm 1468: free(goid.elements);
1.46 markus 1469:
1.183 ! markus 1470: sshbuf_reset(m);
! 1471: if ((r = sshbuf_put_u32(m, major)) != 0)
! 1472: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.46 markus 1473:
1.64 stevesk 1474: mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
1.46 markus 1475:
1476: /* Now we have a context, enable the step */
1477: monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1478:
1479: return (0);
1480: }
1481:
1482: int
1.183 ! markus 1483: mm_answer_gss_accept_ctx(int sock, struct sshbuf *m)
1.46 markus 1484: {
1485: gss_buffer_desc in;
1486: gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
1.64 stevesk 1487: OM_uint32 major, minor;
1.46 markus 1488: OM_uint32 flags = 0; /* GSI needs this */
1.183 ! markus 1489: int r;
1.46 markus 1490:
1.164 djm 1491: if (!options.gss_authentication)
1492: fatal("%s: GSSAPI authentication not enabled", __func__);
1493:
1.183 ! markus 1494: if ((r = sshbuf_get_string(m, &in.value, &in.length)) != 0)
! 1495: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.46 markus 1496: major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1.124 djm 1497: free(in.value);
1.46 markus 1498:
1.183 ! markus 1499: sshbuf_reset(m);
! 1500: if ((r = sshbuf_put_u32(m, major)) != 0 ||
! 1501: (r = sshbuf_put_string(m, out.value, out.length)) != 0 ||
! 1502: (r = sshbuf_put_u32(m, flags)) != 0)
! 1503: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.59 avsm 1504: mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
1.46 markus 1505:
1506: gss_release_buffer(&minor, &out);
1507:
1.64 stevesk 1508: if (major == GSS_S_COMPLETE) {
1.46 markus 1509: monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
1510: monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1.52 markus 1511: monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
1.46 markus 1512: }
1513: return (0);
1514: }
1515:
1516: int
1.183 ! markus 1517: mm_answer_gss_checkmic(int sock, struct sshbuf *m)
1.52 markus 1518: {
1519: gss_buffer_desc gssbuf, mic;
1520: OM_uint32 ret;
1.54 djm 1521:
1.164 djm 1522: if (!options.gss_authentication)
1523: fatal("%s: GSSAPI authentication not enabled", __func__);
1524:
1.183 ! markus 1525: if ((r = sshbuf_get_string(m, &gssbuf.value, &gssbuf.length)) != 0 ||
! 1526: (r = sshbuf_get_string(m, &mic.value, &mic.length)) != 0)
! 1527: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.54 djm 1528:
1.52 markus 1529: ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
1.54 djm 1530:
1.124 djm 1531: free(gssbuf.value);
1532: free(mic.value);
1.54 djm 1533:
1.183 ! markus 1534: sshbuf_reset(m);
! 1535: if ((r = sshbuf_put_u32(m, ret)) != 0)
! 1536: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.54 djm 1537:
1.59 avsm 1538: mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
1.54 djm 1539:
1.52 markus 1540: if (!GSS_ERROR(ret))
1541: monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1.54 djm 1542:
1.52 markus 1543: return (0);
1544: }
1545:
1546: int
1.183 ! markus 1547: mm_answer_gss_userok(int sock, struct sshbuf *m)
1.46 markus 1548: {
1549: int authenticated;
1.172 djm 1550: const char *displayname;
1.164 djm 1551:
1552: if (!options.gss_authentication)
1553: fatal("%s: GSSAPI authentication not enabled", __func__);
1.46 markus 1554:
1555: authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1556:
1.183 ! markus 1557: sshbuf_reset(m);
! 1558: if ((r = sshbuf_put_u32(m, authenticated)) != 0)
! 1559: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.46 markus 1560:
1561: debug3("%s: sending result %d", __func__, authenticated);
1.59 avsm 1562: mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
1.46 markus 1563:
1.64 stevesk 1564: auth_method = "gssapi-with-mic";
1.172 djm 1565:
1566: if ((displayname = ssh_gssapi_displayname()) != NULL)
1567: auth2_record_info(authctxt, "%s", displayname);
1.46 markus 1568:
1569: /* Monitor loop will terminate if authenticated */
1570: return (authenticated);
1571: }
1572: #endif /* GSSAPI */
1.100 djm 1573:
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