Annotation of src/usr.bin/ssh/monitor.c, Revision 1.224
1.224 ! djm 1: /* $OpenBSD: monitor.c,v 1.223 2021/01/27 10:05:28 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"
1.203 djm 83: #include "sk-api.h"
1.189 djm 84:
1.46 markus 85: #ifdef GSSAPI
86: static Gssctxt *gsscontext = NULL;
87: #endif
88:
1.1 provos 89: /* Imports */
90: extern ServerOptions options;
91: extern u_int utmp_len;
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:
1.191 djm 100: int mm_answer_moduli(struct ssh *, int, struct sshbuf *);
101: int mm_answer_sign(struct ssh *, int, struct sshbuf *);
102: int mm_answer_pwnamallow(struct ssh *, int, struct sshbuf *);
103: int mm_answer_auth2_read_banner(struct ssh *, int, struct sshbuf *);
104: int mm_answer_authserv(struct ssh *, int, struct sshbuf *);
105: int mm_answer_authpassword(struct ssh *, int, struct sshbuf *);
106: int mm_answer_bsdauthquery(struct ssh *, int, struct sshbuf *);
107: int mm_answer_bsdauthrespond(struct ssh *, int, struct sshbuf *);
108: int mm_answer_skeyquery(struct ssh *, int, struct sshbuf *);
109: int mm_answer_skeyrespond(struct ssh *, int, struct sshbuf *);
110: int mm_answer_keyallowed(struct ssh *, int, struct sshbuf *);
111: int mm_answer_keyverify(struct ssh *, int, struct sshbuf *);
112: int mm_answer_pty(struct ssh *, int, struct sshbuf *);
113: int mm_answer_pty_cleanup(struct ssh *, int, struct sshbuf *);
114: int mm_answer_term(struct ssh *, int, struct sshbuf *);
115: int mm_answer_rsa_keyallowed(struct ssh *, int, struct sshbuf *);
116: int mm_answer_rsa_challenge(struct ssh *, int, struct sshbuf *);
117: int mm_answer_rsa_response(struct ssh *, int, struct sshbuf *);
118: int mm_answer_sesskey(struct ssh *, int, struct sshbuf *);
119: int mm_answer_sessid(struct ssh *, int, struct sshbuf *);
1.1 provos 120:
1.46 markus 121: #ifdef GSSAPI
1.191 djm 122: int mm_answer_gss_setup_ctx(struct ssh *, int, struct sshbuf *);
123: int mm_answer_gss_accept_ctx(struct ssh *, int, struct sshbuf *);
124: int mm_answer_gss_userok(struct ssh *, int, struct sshbuf *);
125: int mm_answer_gss_checkmic(struct ssh *, int, struct sshbuf *);
1.46 markus 126: #endif
1.25 itojun 127:
1.1 provos 128: static Authctxt *authctxt;
1.132 markus 129:
1.1 provos 130: /* local state for key verify */
131: static u_char *key_blob = NULL;
1.183 markus 132: static size_t key_bloblen = 0;
1.224 ! djm 133: static u_int key_blobtype = MM_NOKEY;
1.180 djm 134: static struct sshauthopt *key_opts = NULL;
1.26 markus 135: static char *hostbased_cuser = NULL;
136: static char *hostbased_chost = NULL;
1.1 provos 137: static char *auth_method = "unknown";
1.119 djm 138: static char *auth_submethod = NULL;
1.44 markus 139: static u_int session_id2_len = 0;
1.13 markus 140: static u_char *session_id2 = NULL;
1.40 markus 141: static pid_t monitor_child_pid;
1.1 provos 142:
143: struct mon_table {
144: enum monitor_reqtype type;
145: int flags;
1.191 djm 146: int (*f)(struct ssh *, int, struct sshbuf *);
1.1 provos 147: };
148:
149: #define MON_ISAUTH 0x0004 /* Required for Authentication */
150: #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
151: #define MON_ONCE 0x0010 /* Disable after calling */
1.77 dtucker 152: #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */
1.1 provos 153:
154: #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
155:
156: #define MON_PERMIT 0x1000 /* Request is permitted */
157:
1.191 djm 158: static int monitor_read(struct ssh *, struct monitor *, struct mon_table *,
159: struct mon_table **);
160: static int monitor_read_log(struct monitor *);
161:
1.1 provos 162: struct mon_table mon_dispatch_proto20[] = {
1.132 markus 163: #ifdef WITH_OPENSSL
1.1 provos 164: {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
1.132 markus 165: #endif
1.1 provos 166: {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
167: {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
168: {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
1.10 djm 169: {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
1.1 provos 170: {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
171: {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
1.66 stevesk 172: {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
1.1 provos 173: {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
174: {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
1.46 markus 175: #ifdef GSSAPI
176: {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
1.165 djm 177: {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
178: {MONITOR_REQ_GSSUSEROK, MON_ONCE|MON_AUTHDECIDE, mm_answer_gss_userok},
179: {MONITOR_REQ_GSSCHECKMIC, MON_ONCE, mm_answer_gss_checkmic},
1.46 markus 180: #endif
1.1 provos 181: {0, 0, NULL}
182: };
183:
184: struct mon_table mon_dispatch_postauth20[] = {
1.132 markus 185: #ifdef WITH_OPENSSL
1.1 provos 186: {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
1.132 markus 187: #endif
1.1 provos 188: {MONITOR_REQ_SIGN, 0, mm_answer_sign},
189: {MONITOR_REQ_PTY, 0, mm_answer_pty},
190: {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
191: {MONITOR_REQ_TERM, 0, mm_answer_term},
192: {0, 0, NULL}
193: };
194:
195: struct mon_table *mon_dispatch;
196:
197: /* Specifies if a certain message is allowed at the moment */
198: static void
199: monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
200: {
201: while (ent->f != NULL) {
202: if (ent->type == type) {
203: ent->flags &= ~MON_PERMIT;
204: ent->flags |= permit ? MON_PERMIT : 0;
205: return;
206: }
207: ent++;
208: }
209: }
210:
211: static void
212: monitor_permit_authentications(int permit)
213: {
214: struct mon_table *ent = mon_dispatch;
215:
216: while (ent->f != NULL) {
217: if (ent->flags & MON_AUTH) {
218: ent->flags &= ~MON_PERMIT;
219: ent->flags |= permit ? MON_PERMIT : 0;
220: }
221: ent++;
222: }
223: }
224:
1.50 markus 225: void
1.191 djm 226: monitor_child_preauth(struct ssh *ssh, struct monitor *pmonitor)
1.1 provos 227: {
228: struct mon_table *ent;
1.119 djm 229: int authenticated = 0, partial = 0;
1.1 provos 230:
231: debug3("preauth child monitor started");
232:
1.179 tb 233: if (pmonitor->m_recvfd >= 0)
234: close(pmonitor->m_recvfd);
235: if (pmonitor->m_log_sendfd >= 0)
236: close(pmonitor->m_log_sendfd);
1.114 djm 237: pmonitor->m_log_sendfd = pmonitor->m_recvfd = -1;
238:
1.191 djm 239: authctxt = (Authctxt *)ssh->authctxt;
1.50 markus 240: memset(authctxt, 0, sizeof(*authctxt));
1.180 djm 241: ssh->authctxt = authctxt;
1.50 markus 242:
1.162 markus 243: mon_dispatch = mon_dispatch_proto20;
244: /* Permit requests for moduli and signatures */
245: monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
246: monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
1.1 provos 247:
248: /* The first few requests do not require asynchronous access */
249: while (!authenticated) {
1.119 djm 250: partial = 0;
1.77 dtucker 251: auth_method = "unknown";
1.119 djm 252: auth_submethod = NULL;
1.172 djm 253: auth2_authctxt_reset_info(authctxt);
254:
1.191 djm 255: authenticated = (monitor_read(ssh, pmonitor,
256: mon_dispatch, &ent) == 1);
1.118 djm 257:
258: /* Special handling for multiple required authentications */
259: if (options.num_auth_methods != 0) {
260: if (authenticated &&
261: !auth2_update_methods_lists(authctxt,
1.122 markus 262: auth_method, auth_submethod)) {
1.217 djm 263: debug3_f("method %s: partial", auth_method);
1.118 djm 264: authenticated = 0;
1.119 djm 265: partial = 1;
1.118 djm 266: }
267: }
268:
1.1 provos 269: if (authenticated) {
270: if (!(ent->flags & MON_AUTHDECIDE))
1.217 djm 271: fatal_f("unexpected authentication from %d",
272: ent->type);
1.1 provos 273: if (authctxt->pw->pw_uid == 0 &&
1.180 djm 274: !auth_root_allowed(ssh, auth_method))
1.1 provos 275: authenticated = 0;
276: }
1.77 dtucker 277: if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) {
1.190 djm 278: auth_log(ssh, authenticated, partial,
1.125 djm 279: auth_method, auth_submethod);
1.150 djm 280: if (!partial && !authenticated)
1.1 provos 281: authctxt->failures++;
1.172 djm 282: if (authenticated || partial) {
283: auth2_update_session_info(authctxt,
284: auth_method, auth_submethod);
285: }
1.1 provos 286: }
287: }
288:
289: if (!authctxt->valid)
1.217 djm 290: fatal_f("authenticated invalid user");
1.77 dtucker 291: if (strcmp(auth_method, "unknown") == 0)
1.217 djm 292: fatal_f("authentication method name unknown");
1.1 provos 293:
1.217 djm 294: debug_f("user %s authenticated by privileged process", 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:
1.192 djm 298: mm_get_keystate(ssh, 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
1.191 djm 324: monitor_child_postauth(struct ssh *ssh, 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);
1.207 dtucker 330: ssh_signal(SIGHUP, &monitor_child_handler);
331: ssh_signal(SIGTERM, &monitor_child_handler);
332: ssh_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 (;;)
1.191 djm 347: monitor_read(ssh, 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;
1.215 djm 354: u_int len, level, line;
355: char *msg, *file, *func;
1.183 markus 356: u_char *p;
357: int r;
1.114 djm 358:
1.183 markus 359: if ((logmsg = sshbuf_new()) == NULL)
1.217 djm 360: fatal_f("sshbuf_new");
1.114 djm 361:
362: /* Read length */
1.183 markus 363: if ((r = sshbuf_reserve(logmsg, 4, &p)) != 0)
1.217 djm 364: fatal_fr(r, "reserve len");
1.183 markus 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);
1.217 djm 368: debug_f("child log fd closed");
1.114 djm 369: close(pmonitor->m_log_recvfd);
370: pmonitor->m_log_recvfd = -1;
371: return -1;
372: }
1.217 djm 373: fatal_f("log fd read: %s", strerror(errno));
1.114 djm 374: }
1.183 markus 375: if ((r = sshbuf_get_u32(logmsg, &len)) != 0)
1.217 djm 376: fatal_fr(r, "parse len");
1.114 djm 377: if (len <= 4 || len > 8192)
1.217 djm 378: fatal_f("invalid log message length %u", len);
1.114 djm 379:
380: /* Read severity, message */
1.183 markus 381: sshbuf_reset(logmsg);
382: if ((r = sshbuf_reserve(logmsg, len, &p)) != 0)
1.217 djm 383: fatal_fr(r, "reserve msg");
1.183 markus 384: if (atomicio(read, pmonitor->m_log_recvfd, p, len) != len)
1.217 djm 385: fatal_f("log fd read: %s", strerror(errno));
1.215 djm 386: if ((r = sshbuf_get_cstring(logmsg, &file, NULL)) != 0 ||
387: (r = sshbuf_get_cstring(logmsg, &func, NULL)) != 0 ||
388: (r = sshbuf_get_u32(logmsg, &line)) != 0 ||
389: (r = sshbuf_get_u32(logmsg, &level)) != 0 ||
1.183 markus 390: (r = sshbuf_get_cstring(logmsg, &msg, NULL)) != 0)
1.217 djm 391: fatal_fr(r, "parse");
1.114 djm 392:
393: /* Log it */
394: if (log_level_name(level) == NULL)
1.216 djm 395: fatal_f("invalid log level %u (corrupted message?)", level);
396: sshlog(file, func, line, 0, level, NULL, "%s [preauth]", msg);
1.114 djm 397:
1.183 markus 398: sshbuf_free(logmsg);
1.215 djm 399: free(file);
400: free(func);
1.124 djm 401: free(msg);
1.114 djm 402:
403: return 0;
404: }
405:
1.191 djm 406: static int
407: monitor_read(struct ssh *ssh, struct monitor *pmonitor, struct mon_table *ent,
1.1 provos 408: struct mon_table **pent)
409: {
1.183 markus 410: struct sshbuf *m;
411: int r, ret;
1.1 provos 412: u_char type;
1.114 djm 413: struct pollfd pfd[2];
414:
415: for (;;) {
1.130 tedu 416: memset(&pfd, 0, sizeof(pfd));
1.114 djm 417: pfd[0].fd = pmonitor->m_sendfd;
418: pfd[0].events = POLLIN;
419: pfd[1].fd = pmonitor->m_log_recvfd;
420: pfd[1].events = pfd[1].fd == -1 ? 0 : POLLIN;
1.115 djm 421: if (poll(pfd, pfd[1].fd == -1 ? 1 : 2, -1) == -1) {
422: if (errno == EINTR || errno == EAGAIN)
423: continue;
1.217 djm 424: fatal_f("poll: %s", strerror(errno));
1.115 djm 425: }
1.114 djm 426: if (pfd[1].revents) {
427: /*
428: * Drain all log messages before processing next
429: * monitor request.
430: */
431: monitor_read_log(pmonitor);
432: continue;
433: }
434: if (pfd[0].revents)
435: break; /* Continues below */
436: }
1.1 provos 437:
1.183 markus 438: if ((m = sshbuf_new()) == NULL)
1.217 djm 439: fatal_f("sshbuf_new");
1.1 provos 440:
1.183 markus 441: mm_request_receive(pmonitor->m_sendfd, m);
442: if ((r = sshbuf_get_u8(m, &type)) != 0)
1.217 djm 443: fatal_fr(r, "parse type");
1.1 provos 444:
1.217 djm 445: debug3_f("checking request %d", type);
1.1 provos 446:
447: while (ent->f != NULL) {
448: if (ent->type == type)
449: break;
450: ent++;
451: }
452:
453: if (ent->f != NULL) {
454: if (!(ent->flags & MON_PERMIT))
1.217 djm 455: fatal_f("unpermitted request %d", type);
1.191 djm 456: ret = (*ent->f)(ssh, pmonitor->m_sendfd, m);
1.183 markus 457: sshbuf_free(m);
1.1 provos 458:
459: /* The child may use this request only once, disable it */
460: if (ent->flags & MON_ONCE) {
1.217 djm 461: debug2_f("%d used once, disabling now", type);
1.1 provos 462: ent->flags &= ~MON_PERMIT;
463: }
464:
465: if (pent != NULL)
466: *pent = ent;
1.3 markus 467:
1.1 provos 468: return ret;
469: }
470:
1.217 djm 471: fatal_f("unsupported request: %d", type);
1.1 provos 472:
473: /* NOTREACHED */
474: return (-1);
475: }
476:
477: /* allowed key state */
478: static int
1.203 djm 479: monitor_allowed_key(const u_char *blob, u_int bloblen)
1.1 provos 480: {
481: /* make sure key is allowed */
482: if (key_blob == NULL || key_bloblen != bloblen ||
1.108 djm 483: timingsafe_bcmp(key_blob, blob, key_bloblen))
1.1 provos 484: return (0);
485: return (1);
486: }
487:
488: static void
489: monitor_reset_key_state(void)
490: {
491: /* reset state */
1.124 djm 492: free(key_blob);
493: free(hostbased_cuser);
494: free(hostbased_chost);
1.180 djm 495: sshauthopt_free(key_opts);
1.1 provos 496: key_blob = NULL;
497: key_bloblen = 0;
498: key_blobtype = MM_NOKEY;
1.180 djm 499: key_opts = NULL;
1.1 provos 500: hostbased_cuser = NULL;
501: hostbased_chost = NULL;
502: }
503:
1.132 markus 504: #ifdef WITH_OPENSSL
1.1 provos 505: int
1.191 djm 506: mm_answer_moduli(struct ssh *ssh, int sock, struct sshbuf *m)
1.1 provos 507: {
508: DH *dh;
1.187 djm 509: const BIGNUM *dh_p, *dh_g;
1.183 markus 510: int r;
511: u_int min, want, max;
1.1 provos 512:
1.183 markus 513: if ((r = sshbuf_get_u32(m, &min)) != 0 ||
514: (r = sshbuf_get_u32(m, &want)) != 0 ||
515: (r = sshbuf_get_u32(m, &max)) != 0)
1.217 djm 516: fatal_fr(r, "parse");
1.1 provos 517:
1.217 djm 518: debug3_f("got parameters: %d %d %d", min, want, max);
1.1 provos 519: /* We need to check here, too, in case the child got corrupted */
520: if (max < min || want < min || max < want)
1.217 djm 521: fatal_f("bad parameters: %d %d %d", 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)
1.217 djm 528: fatal_fr(r, "assemble empty");
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)
1.217 djm 536: fatal_fr(r, "assemble");
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
1.191 djm 546: mm_answer_sign(struct ssh *ssh, int sock, struct sshbuf *m)
1.1 provos 547: {
1.138 djm 548: extern int auth_sock; /* XXX move to state struct? */
549: struct sshkey *key;
1.157 djm 550: struct sshbuf *sigbuf = NULL;
551: u_char *p = NULL, *signature = NULL;
552: char *alg = NULL;
1.155 markus 553: size_t datlen, siglen, alglen;
1.159 djm 554: int r, is_proof = 0;
1.185 markus 555: u_int keyid, compat;
1.145 djm 556: const char proof_req[] = "hostkeys-prove-00@openssh.com";
1.3 markus 557:
1.217 djm 558: debug3_f("entering");
1.1 provos 559:
1.138 djm 560: if ((r = sshbuf_get_u32(m, &keyid)) != 0 ||
1.155 markus 561: (r = sshbuf_get_string(m, &p, &datlen)) != 0 ||
1.185 markus 562: (r = sshbuf_get_cstring(m, &alg, &alglen)) != 0 ||
563: (r = sshbuf_get_u32(m, &compat)) != 0)
1.217 djm 564: fatal_fr(r, "parse");
1.159 djm 565: if (keyid > INT_MAX)
1.217 djm 566: fatal_f("invalid key ID");
1.1 provos 567:
1.69 djm 568: /*
1.110 djm 569: * Supported KEX types use SHA1 (20 bytes), SHA256 (32 bytes),
570: * SHA384 (48 bytes) and SHA512 (64 bytes).
1.144 djm 571: *
572: * Otherwise, verify the signature request is for a hostkey
573: * proof.
574: *
575: * XXX perform similar check for KEX signature requests too?
576: * it's not trivial, since what is signed is the hash, rather
577: * than the full kex structure...
1.69 djm 578: */
1.144 djm 579: if (datlen != 20 && datlen != 32 && datlen != 48 && datlen != 64) {
580: /*
581: * Construct expected hostkey proof and compare it to what
582: * the client sent us.
583: */
584: if (session_id2_len == 0) /* hostkeys is never first */
1.217 djm 585: fatal_f("bad data length: %zu", datlen);
1.144 djm 586: if ((key = get_hostkey_public_by_index(keyid, ssh)) == NULL)
1.217 djm 587: fatal_f("no hostkey for index %d", keyid);
1.144 djm 588: if ((sigbuf = sshbuf_new()) == NULL)
1.217 djm 589: fatal_f("sshbuf_new");
1.145 djm 590: if ((r = sshbuf_put_cstring(sigbuf, proof_req)) != 0 ||
591: (r = sshbuf_put_string(sigbuf, session_id2,
1.152 jsg 592: session_id2_len)) != 0 ||
1.144 djm 593: (r = sshkey_puts(key, sigbuf)) != 0)
1.217 djm 594: fatal_fr(r, "assemble private key proof");
1.144 djm 595: if (datlen != sshbuf_len(sigbuf) ||
596: memcmp(p, sshbuf_ptr(sigbuf), sshbuf_len(sigbuf)) != 0)
1.217 djm 597: fatal_f("bad data length: %zu, hostkey proof len %zu",
598: datlen, sshbuf_len(sigbuf));
1.144 djm 599: sshbuf_free(sigbuf);
600: is_proof = 1;
601: }
1.1 provos 602:
1.13 markus 603: /* save session id, it will be passed on the first call */
604: if (session_id2_len == 0) {
605: session_id2_len = datlen;
606: session_id2 = xmalloc(session_id2_len);
607: memcpy(session_id2, p, session_id2_len);
608: }
609:
1.127 markus 610: if ((key = get_hostkey_by_index(keyid)) != NULL) {
1.155 markus 611: if ((r = sshkey_sign(key, &signature, &siglen, p, datlen, alg,
1.213 djm 612: options.sk_provider, NULL, compat)) != 0)
1.217 djm 613: fatal_fr(r, "sign");
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,
1.217 djm 617: p, datlen, alg, compat)) != 0)
618: fatal_fr(r, "agent sign");
1.127 markus 619: } else
1.217 djm 620: fatal_f("no hostkey from index %d", keyid);
1.1 provos 621:
1.217 djm 622: debug3_f("%s signature %p(%zu)", is_proof ? "hostkey proof" : "KEX",
623: signature, siglen);
1.1 provos 624:
1.138 djm 625: sshbuf_reset(m);
626: if ((r = sshbuf_put_string(m, signature, siglen)) != 0)
1.217 djm 627: fatal_fr(r, "assemble");
1.1 provos 628:
1.157 djm 629: free(alg);
1.124 djm 630: free(p);
631: free(signature);
1.1 provos 632:
1.59 avsm 633: mm_request_send(sock, MONITOR_ANS_SIGN, m);
1.1 provos 634:
635: /* Turn on permissions for getpwnam */
636: monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
637:
638: return (0);
639: }
640:
1.218 djm 641: #define PUTPW(b, id) \
642: do { \
643: if ((r = sshbuf_put_string(b, \
644: &pwent->id, sizeof(pwent->id))) != 0) \
645: fatal_fr(r, "assemble %s", #id); \
646: } while (0)
647:
1.1 provos 648: /* Retrieves the password entry and also checks if the user is permitted */
649: int
1.191 djm 650: mm_answer_pwnamallow(struct ssh *ssh, int sock, struct sshbuf *m)
1.1 provos 651: {
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:
1.217 djm 657: debug3_f("entering");
1.1 provos 658:
659: if (authctxt->attempt++ != 0)
1.217 djm 660: fatal_f("multiple attempts for getpwnam");
1.1 provos 661:
1.183 markus 662: if ((r = sshbuf_get_cstring(m, &username, NULL)) != 0)
1.217 djm 663: fatal_fr(r, "parse");
1.1 provos 664:
1.190 djm 665: pwent = getpwnamallow(ssh, 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)
1.217 djm 675: fatal_fr(r, "assemble fakepw");
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:
1.218 djm 684: /* XXX send fake class/dir/shell, etc. */
685: if ((r = sshbuf_put_u8(m, 1)) != 0)
686: fatal_fr(r, "assemble ok");
687: PUTPW(m, pw_uid);
688: PUTPW(m, pw_gid);
689: PUTPW(m, pw_change);
690: PUTPW(m, pw_expire);
691: if ((r = sshbuf_put_cstring(m, pwent->pw_name)) != 0 ||
1.183 markus 692: (r = sshbuf_put_cstring(m, "*")) != 0 ||
693: (r = sshbuf_put_cstring(m, pwent->pw_gecos)) != 0 ||
694: (r = sshbuf_put_cstring(m, pwent->pw_class)) != 0 ||
695: (r = sshbuf_put_cstring(m, pwent->pw_dir)) != 0 ||
696: (r = sshbuf_put_cstring(m, pwent->pw_shell)) != 0)
1.217 djm 697: fatal_fr(r, "assemble pw");
1.94 dtucker 698:
699: out:
1.167 djm 700: ssh_packet_set_log_preamble(ssh, "%suser %s",
701: authctxt->valid ? "authenticating" : "invalid ", authctxt->user);
1.183 markus 702: if ((r = sshbuf_put_string(m, &options, sizeof(options))) != 0)
1.217 djm 703: fatal_fr(r, "assemble options");
1.112 djm 704:
705: #define M_CP_STROPT(x) do { \
1.217 djm 706: if (options.x != NULL && \
707: (r = sshbuf_put_cstring(m, options.x)) != 0) \
708: fatal_fr(r, "assemble %s", #x); \
1.112 djm 709: } while (0)
1.113 djm 710: #define M_CP_STRARRAYOPT(x, nx) do { \
1.183 markus 711: for (i = 0; i < options.nx; i++) { \
712: if ((r = sshbuf_put_cstring(m, options.x[i])) != 0) \
1.217 djm 713: fatal_fr(r, "assemble %s", #x); \
1.183 markus 714: } \
1.113 djm 715: } while (0)
1.112 djm 716: /* See comment in servconf.h */
717: COPY_MATCH_STRING_OPTS();
718: #undef M_CP_STROPT
1.113 djm 719: #undef M_CP_STRARRAYOPT
1.118 djm 720:
721: /* Create valid auth method lists */
1.162 markus 722: if (auth2_setup_methods_lists(authctxt) != 0) {
1.118 djm 723: /*
724: * The monitor will continue long enough to let the child
725: * run to it's packet_disconnect(), but it must not allow any
726: * authentication to succeed.
727: */
1.217 djm 728: debug_f("no valid authentication method lists");
1.118 djm 729: }
730:
1.217 djm 731: debug3_f("sending MONITOR_ANS_PWNAM: %d", allowed);
1.59 avsm 732: mm_request_send(sock, MONITOR_ANS_PWNAM, m);
1.1 provos 733:
1.162 markus 734: /* Allow service/style information on the auth context */
735: monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
736: monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
1.10 djm 737:
738: return (0);
739: }
740:
1.191 djm 741: int mm_answer_auth2_read_banner(struct ssh *ssh, int sock, struct sshbuf *m)
1.10 djm 742: {
743: char *banner;
1.183 markus 744: int r;
1.10 djm 745:
1.183 markus 746: sshbuf_reset(m);
1.10 djm 747: banner = auth2_read_banner();
1.183 markus 748: if ((r = sshbuf_put_cstring(m, banner != NULL ? banner : "")) != 0)
1.217 djm 749: fatal_fr(r, "assemble");
1.59 avsm 750: mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
1.124 djm 751: free(banner);
1.1 provos 752:
753: return (0);
754: }
755:
756: int
1.191 djm 757: mm_answer_authserv(struct ssh *ssh, int sock, struct sshbuf *m)
1.1 provos 758: {
1.183 markus 759: int r;
760:
1.1 provos 761: monitor_permit_authentications(1);
762:
1.183 markus 763: if ((r = sshbuf_get_cstring(m, &authctxt->service, NULL)) != 0 ||
764: (r = sshbuf_get_cstring(m, &authctxt->style, NULL)) != 0)
1.217 djm 765: fatal_fr(r, "parse");
766: debug3_f("service=%s, style=%s", 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
1.191 djm 777: mm_answer_authpassword(struct ssh *ssh, int sock, struct sshbuf *m)
1.1 provos 778: {
779: static int call_count;
780: char *passwd;
1.183 markus 781: int r, authenticated;
782: size_t plen;
1.1 provos 783:
1.164 djm 784: if (!options.password_authentication)
1.217 djm 785: fatal_f("password authentication not enabled");
1.183 markus 786: if ((r = sshbuf_get_cstring(m, &passwd, &plen)) != 0)
1.217 djm 787: fatal_fr(r, "parse");
1.1 provos 788: /* Only authenticate if the context is valid */
1.12 markus 789: authenticated = options.password_authentication &&
1.180 djm 790: auth_password(ssh, passwd);
1.209 jsg 791: freezero(passwd, plen);
1.1 provos 792:
1.183 markus 793: sshbuf_reset(m);
794: if ((r = sshbuf_put_u32(m, authenticated)) != 0)
1.217 djm 795: fatal_fr(r, "assemble");
1.1 provos 796:
1.217 djm 797: debug3_f("sending result %d", authenticated);
1.59 avsm 798: mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
1.1 provos 799:
800: call_count++;
801: if (plen == 0 && call_count == 1)
802: auth_method = "none";
803: else
804: auth_method = "password";
805:
806: /* Causes monitor loop to terminate if authenticated */
807: return (authenticated);
808: }
809:
810: int
1.191 djm 811: mm_answer_bsdauthquery(struct ssh *ssh, int sock, struct sshbuf *m)
1.1 provos 812: {
813: char *name, *infotxt;
1.183 markus 814: u_int numprompts, *echo_on, success;
1.1 provos 815: char **prompts;
1.183 markus 816: int r;
1.1 provos 817:
1.164 djm 818: if (!options.kbd_interactive_authentication)
1.217 djm 819: fatal_f("kbd-int authentication not enabled");
1.31 markus 820: success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
821: &prompts, &echo_on) < 0 ? 0 : 1;
1.1 provos 822:
1.183 markus 823: sshbuf_reset(m);
824: if ((r = sshbuf_put_u32(m, success)) != 0)
1.217 djm 825: fatal_fr(r, "assemble");
1.183 markus 826: if (success) {
827: if ((r = sshbuf_put_cstring(m, prompts[0])) != 0)
1.217 djm 828: fatal_fr(r, "assemble prompt");
1.183 markus 829: }
1.1 provos 830:
1.217 djm 831: debug3_f("sending challenge success: %u", success);
1.59 avsm 832: mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
1.1 provos 833:
1.31 markus 834: if (success) {
1.124 djm 835: free(name);
836: free(infotxt);
837: free(prompts);
838: free(echo_on);
1.1 provos 839: }
840:
841: return (0);
842: }
843:
844: int
1.191 djm 845: mm_answer_bsdauthrespond(struct ssh *ssh, int sock, struct sshbuf *m)
1.1 provos 846: {
847: char *response;
1.183 markus 848: int r, authok;
1.1 provos 849:
1.164 djm 850: if (!options.kbd_interactive_authentication)
1.217 djm 851: fatal_f("kbd-int authentication not enabled");
1.154 mmcc 852: if (authctxt->as == NULL)
1.217 djm 853: fatal_f("no bsd auth session");
1.1 provos 854:
1.183 markus 855: if ((r = sshbuf_get_cstring(m, &response, NULL)) != 0)
1.217 djm 856: fatal_fr(r, "parse");
1.12 markus 857: authok = options.challenge_response_authentication &&
858: auth_userresponse(authctxt->as, response, 0);
1.1 provos 859: authctxt->as = NULL;
1.217 djm 860: debug3_f("<%s> = <%d>", response, authok);
1.124 djm 861: free(response);
1.1 provos 862:
1.183 markus 863: sshbuf_reset(m);
864: if ((r = sshbuf_put_u32(m, authok)) != 0)
1.217 djm 865: fatal_fr(r, "assemble");
1.1 provos 866:
1.217 djm 867: debug3_f("sending authenticated: %d", authok);
1.59 avsm 868: mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
1.1 provos 869:
1.162 markus 870: auth_method = "keyboard-interactive";
871: auth_submethod = "bsdauth";
1.1 provos 872:
873: return (authok != 0);
874: }
875:
1.188 djm 876: /*
877: * Check that the key type appears in the supplied pattern list, ignoring
878: * mismatches in the signature algorithm. (Signature algorithm checks are
879: * performed in the unprivileged authentication code).
880: * Returns 1 on success, 0 otherwise.
881: */
882: static int
883: key_base_type_match(const char *method, const struct sshkey *key,
884: const char *list)
885: {
886: char *s, *l, *ol = xstrdup(list);
887: int found = 0;
888:
889: l = ol;
890: for ((s = strsep(&l, ",")); s && *s != '\0'; (s = strsep(&l, ","))) {
891: if (sshkey_type_from_name(s) == key->type) {
892: found = 1;
893: break;
894: }
895: }
896: if (!found) {
897: error("%s key type %s is not in permitted list %s", method,
898: sshkey_ssh_name(key), list);
899: }
900:
901: free(ol);
902: return found;
903: }
904:
1.1 provos 905: int
1.191 djm 906: mm_answer_keyallowed(struct ssh *ssh, int sock, struct sshbuf *m)
1.1 provos 907: {
1.183 markus 908: struct sshkey *key = NULL;
1.26 markus 909: char *cuser, *chost;
1.183 markus 910: u_int pubkey_auth_attempt;
1.224 ! djm 911: u_int type = 0;
1.180 djm 912: int r, allowed = 0;
913: struct sshauthopt *opts = NULL;
1.1 provos 914:
1.217 djm 915: debug3_f("entering");
1.183 markus 916: if ((r = sshbuf_get_u32(m, &type)) != 0 ||
917: (r = sshbuf_get_cstring(m, &cuser, NULL)) != 0 ||
918: (r = sshbuf_get_cstring(m, &chost, NULL)) != 0 ||
919: (r = sshkey_froms(m, &key)) != 0 ||
920: (r = sshbuf_get_u32(m, &pubkey_auth_attempt)) != 0)
1.217 djm 921: fatal_fr(r, "parse");
1.1 provos 922:
1.217 djm 923: debug3_f("key_from_blob: %p", key);
1.1 provos 924:
1.51 djm 925: if (key != NULL && authctxt->valid) {
1.137 djm 926: /* These should not make it past the privsep child */
1.185 markus 927: if (sshkey_type_plain(key->type) == KEY_RSA &&
1.222 djm 928: (ssh->compat & SSH_BUG_RSASIGMD5) != 0)
1.217 djm 929: fatal_f("passed a SSH_BUG_RSASIGMD5 key");
1.137 djm 930:
1.63 deraadt 931: switch (type) {
1.1 provos 932: case MM_USERKEY:
1.77 dtucker 933: auth_method = "publickey";
1.180 djm 934: if (!options.pubkey_authentication)
935: break;
936: if (auth2_key_already_used(authctxt, key))
937: break;
1.188 djm 938: if (!key_base_type_match(auth_method, key,
1.220 dtucker 939: options.pubkey_accepted_algos))
1.180 djm 940: break;
941: allowed = user_key_allowed(ssh, authctxt->pw, key,
942: pubkey_auth_attempt, &opts);
1.1 provos 943: break;
944: case MM_HOSTKEY:
1.180 djm 945: auth_method = "hostbased";
946: if (!options.hostbased_authentication)
947: break;
948: if (auth2_key_already_used(authctxt, key))
949: break;
1.188 djm 950: if (!key_base_type_match(auth_method, key,
1.221 dtucker 951: options.hostbased_accepted_algos))
1.180 djm 952: break;
1.192 djm 953: allowed = hostbased_key_allowed(ssh, authctxt->pw,
1.1 provos 954: cuser, chost, key);
1.172 djm 955: auth2_record_info(authctxt,
1.126 djm 956: "client user \"%.100s\", client host \"%.100s\"",
957: cuser, chost);
1.1 provos 958: break;
959: default:
1.224 ! djm 960: fatal_f("unknown key type %u", type);
1.1 provos 961: break;
962: }
1.33 markus 963: }
1.161 djm 964:
1.217 djm 965: debug3_f("%s authentication%s: %s key is %s", auth_method,
966: pubkey_auth_attempt ? "" : " test",
1.180 djm 967: (key == NULL || !authctxt->valid) ? "invalid" : sshkey_type(key),
968: allowed ? "allowed" : "not allowed");
1.161 djm 969:
1.172 djm 970: auth2_record_key(authctxt, 0, key);
1.1 provos 971:
972: /* clear temporarily storage (used by verify) */
973: monitor_reset_key_state();
974:
975: if (allowed) {
976: /* Save temporarily for comparison in verify */
1.183 markus 977: if ((r = sshkey_to_blob(key, &key_blob, &key_bloblen)) != 0)
1.217 djm 978: fatal_fr(r, "sshkey_to_blob");
1.1 provos 979: key_blobtype = type;
1.180 djm 980: key_opts = opts;
1.1 provos 981: hostbased_cuser = cuser;
982: hostbased_chost = chost;
1.72 djm 983: } else {
1.77 dtucker 984: /* Log failed attempt */
1.190 djm 985: auth_log(ssh, 0, 0, auth_method, NULL);
1.124 djm 986: free(cuser);
987: free(chost);
1.1 provos 988: }
1.183 markus 989: sshkey_free(key);
1.1 provos 990:
1.183 markus 991: sshbuf_reset(m);
992: if ((r = sshbuf_put_u32(m, allowed)) != 0)
1.217 djm 993: fatal_fr(r, "assemble");
1.180 djm 994: if (opts != NULL && (r = sshauthopt_serialise(opts, m, 1)) != 0)
1.217 djm 995: fatal_fr(r, "sshauthopt_serialise");
1.180 djm 996: mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
1.1 provos 997:
1.180 djm 998: if (!allowed)
999: sshauthopt_free(opts);
1.1 provos 1000:
1001: return (0);
1002: }
1003:
1004: static int
1.222 djm 1005: monitor_valid_userblob(struct ssh *ssh, const u_char *data, u_int datalen)
1.1 provos 1006: {
1.183 markus 1007: struct sshbuf *b;
1008: const u_char *p;
1.159 djm 1009: char *userstyle, *cp;
1.183 markus 1010: size_t len;
1011: u_char type;
1012: int r, fail = 0;
1.1 provos 1013:
1.203 djm 1014: if ((b = sshbuf_from(data, datalen)) == NULL)
1.217 djm 1015: fatal_f("sshbuf_from");
1.3 markus 1016:
1.222 djm 1017: if (ssh->compat & SSH_OLD_SESSIONID) {
1.183 markus 1018: p = sshbuf_ptr(b);
1019: len = sshbuf_len(b);
1.13 markus 1020: if ((session_id2 == NULL) ||
1021: (len < session_id2_len) ||
1.108 djm 1022: (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1.13 markus 1023: fail++;
1.183 markus 1024: if ((r = sshbuf_consume(b, session_id2_len)) != 0)
1.217 djm 1025: fatal_fr(r, "consume");
1.1 provos 1026: } else {
1.183 markus 1027: if ((r = sshbuf_get_string_direct(b, &p, &len)) != 0)
1.217 djm 1028: fatal_fr(r, "parse sessionid");
1.13 markus 1029: if ((session_id2 == NULL) ||
1030: (len != session_id2_len) ||
1.108 djm 1031: (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1.1 provos 1032: fail++;
1033: }
1.183 markus 1034: if ((r = sshbuf_get_u8(b, &type)) != 0)
1.217 djm 1035: fatal_fr(r, "parse type");
1.183 markus 1036: if (type != SSH2_MSG_USERAUTH_REQUEST)
1.1 provos 1037: fail++;
1.183 markus 1038: if ((r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
1.217 djm 1039: fatal_fr(r, "parse userstyle");
1.121 djm 1040: xasprintf(&userstyle, "%s%s%s", authctxt->user,
1041: authctxt->style ? ":" : "",
1042: authctxt->style ? authctxt->style : "");
1.159 djm 1043: if (strcmp(userstyle, cp) != 0) {
1044: logit("wrong user name passed to monitor: "
1045: "expected %s != %.100s", userstyle, cp);
1.1 provos 1046: fail++;
1047: }
1.124 djm 1048: free(userstyle);
1.159 djm 1049: free(cp);
1.183 markus 1050: if ((r = sshbuf_skip_string(b)) != 0 || /* service */
1051: (r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
1.217 djm 1052: fatal_fr(r, "parse method");
1.178 djm 1053: if (strcmp("publickey", cp) != 0)
1054: fail++;
1055: free(cp);
1.183 markus 1056: if ((r = sshbuf_get_u8(b, &type)) != 0)
1.217 djm 1057: fatal_fr(r, "parse pktype");
1.183 markus 1058: if (type == 0)
1.178 djm 1059: fail++;
1.183 markus 1060: if ((r = sshbuf_skip_string(b)) != 0 || /* pkalg */
1061: (r = sshbuf_skip_string(b)) != 0) /* pkblob */
1.217 djm 1062: fatal_fr(r, "parse pk");
1.183 markus 1063: if (sshbuf_len(b) != 0)
1.1 provos 1064: fail++;
1.183 markus 1065: sshbuf_free(b);
1.1 provos 1066: return (fail == 0);
1067: }
1068:
1069: static int
1.203 djm 1070: monitor_valid_hostbasedblob(const u_char *data, u_int datalen,
1071: const char *cuser, const char *chost)
1.1 provos 1072: {
1.183 markus 1073: struct sshbuf *b;
1074: const u_char *p;
1075: char *cp, *userstyle;
1076: size_t len;
1077: int r, fail = 0;
1078: u_char type;
1.1 provos 1079:
1.203 djm 1080: if ((b = sshbuf_from(data, datalen)) == NULL)
1.217 djm 1081: fatal_f("sshbuf_new");
1.203 djm 1082: if ((r = sshbuf_get_string_direct(b, &p, &len)) != 0)
1.217 djm 1083: fatal_fr(r, "parse sessionid");
1.3 markus 1084:
1.13 markus 1085: if ((session_id2 == NULL) ||
1086: (len != session_id2_len) ||
1.108 djm 1087: (timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
1.1 provos 1088: fail++;
1.13 markus 1089:
1.183 markus 1090: if ((r = sshbuf_get_u8(b, &type)) != 0)
1.217 djm 1091: fatal_fr(r, "parse type");
1.183 markus 1092: if (type != SSH2_MSG_USERAUTH_REQUEST)
1.1 provos 1093: fail++;
1.183 markus 1094: if ((r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
1.217 djm 1095: fatal_fr(r, "parse userstyle");
1.121 djm 1096: xasprintf(&userstyle, "%s%s%s", authctxt->user,
1097: authctxt->style ? ":" : "",
1098: authctxt->style ? authctxt->style : "");
1.183 markus 1099: if (strcmp(userstyle, cp) != 0) {
1100: logit("wrong user name passed to monitor: "
1101: "expected %s != %.100s", userstyle, cp);
1.1 provos 1102: fail++;
1103: }
1.121 djm 1104: free(userstyle);
1.183 markus 1105: free(cp);
1106: if ((r = sshbuf_skip_string(b)) != 0 || /* service */
1107: (r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
1.217 djm 1108: fatal_fr(r, "parse method");
1.183 markus 1109: if (strcmp(cp, "hostbased") != 0)
1.1 provos 1110: fail++;
1.183 markus 1111: free(cp);
1112: if ((r = sshbuf_skip_string(b)) != 0 || /* pkalg */
1113: (r = sshbuf_skip_string(b)) != 0) /* pkblob */
1.217 djm 1114: fatal_fr(r, "parse pk");
1.1 provos 1115:
1116: /* verify client host, strip trailing dot if necessary */
1.183 markus 1117: if ((r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
1.217 djm 1118: fatal_fr(r, "parse host");
1.183 markus 1119: if (((len = strlen(cp)) > 0) && cp[len - 1] == '.')
1120: cp[len - 1] = '\0';
1121: if (strcmp(cp, chost) != 0)
1.1 provos 1122: fail++;
1.183 markus 1123: free(cp);
1.1 provos 1124:
1125: /* verify client user */
1.183 markus 1126: if ((r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
1.217 djm 1127: fatal_fr(r, "parse ruser");
1.183 markus 1128: if (strcmp(cp, cuser) != 0)
1.1 provos 1129: fail++;
1.183 markus 1130: free(cp);
1.1 provos 1131:
1.183 markus 1132: if (sshbuf_len(b) != 0)
1.1 provos 1133: fail++;
1.183 markus 1134: sshbuf_free(b);
1.1 provos 1135: return (fail == 0);
1136: }
1137:
1138: int
1.191 djm 1139: mm_answer_keyverify(struct ssh *ssh, int sock, struct sshbuf *m)
1.1 provos 1140: {
1.168 markus 1141: struct sshkey *key;
1.203 djm 1142: const u_char *signature, *data, *blob;
1143: char *sigalg = NULL, *fp = NULL;
1.169 markus 1144: size_t signaturelen, datalen, bloblen;
1.214 djm 1145: int r, ret, req_presence = 0, req_verify = 0, valid_data = 0;
1146: int encoded_ret;
1.202 djm 1147: struct sshkey_sig_details *sig_details = NULL;
1.1 provos 1148:
1.203 djm 1149: if ((r = sshbuf_get_string_direct(m, &blob, &bloblen)) != 0 ||
1150: (r = sshbuf_get_string_direct(m, &signature, &signaturelen)) != 0 ||
1151: (r = sshbuf_get_string_direct(m, &data, &datalen)) != 0 ||
1.176 djm 1152: (r = sshbuf_get_cstring(m, &sigalg, NULL)) != 0)
1.217 djm 1153: fatal_fr(r, "parse");
1.1 provos 1154:
1155: if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1.8 mouring 1156: !monitor_allowed_key(blob, bloblen))
1.217 djm 1157: fatal_f("bad key, not previously allowed");
1.1 provos 1158:
1.177 djm 1159: /* Empty signature algorithm means NULL. */
1160: if (*sigalg == '\0') {
1161: free(sigalg);
1162: sigalg = NULL;
1163: }
1164:
1.169 markus 1165: /* XXX use sshkey_froms here; need to change key_blob, etc. */
1166: if ((r = sshkey_from_blob(blob, bloblen, &key)) != 0)
1.217 djm 1167: fatal_fr(r, "parse key");
1.1 provos 1168:
1169: switch (key_blobtype) {
1170: case MM_USERKEY:
1.222 djm 1171: valid_data = monitor_valid_userblob(ssh, data, datalen);
1.172 djm 1172: auth_method = "publickey";
1.1 provos 1173: break;
1174: case MM_HOSTKEY:
1175: valid_data = monitor_valid_hostbasedblob(data, datalen,
1176: hostbased_cuser, hostbased_chost);
1.172 djm 1177: auth_method = "hostbased";
1.1 provos 1178: break;
1179: default:
1180: valid_data = 0;
1181: break;
1182: }
1183: if (!valid_data)
1.223 djm 1184: fatal_f("bad %s signature data blob",
1185: key_blobtype == MM_USERKEY ? "userkey" :
1186: (key_blobtype == MM_HOSTKEY ? "hostkey" : "unknown"));
1.1 provos 1187:
1.203 djm 1188: if ((fp = sshkey_fingerprint(key, options.fingerprint_hash,
1189: SSH_FP_DEFAULT)) == NULL)
1.217 djm 1190: fatal_f("sshkey_fingerprint failed");
1.203 djm 1191:
1.169 markus 1192: ret = sshkey_verify(key, signature, signaturelen, data, datalen,
1.202 djm 1193: sigalg, ssh->compat, &sig_details);
1.217 djm 1194: debug3_f("%s %p signature %s%s%s", auth_method, key,
1.201 djm 1195: (ret == 0) ? "verified" : "unverified",
1196: (ret != 0) ? ": " : "", (ret != 0) ? ssh_err(ret) : "");
1.203 djm 1197:
1198: if (ret == 0 && key_blobtype == MM_USERKEY && sig_details != NULL) {
1199: req_presence = (options.pubkey_auth_options &
1.204 djm 1200: PUBKEYAUTH_TOUCH_REQUIRED) ||
1201: !key_opts->no_require_user_presence;
1.203 djm 1202: if (req_presence &&
1203: (sig_details->sk_flags & SSH_SK_USER_PRESENCE_REQD) == 0) {
1204: error("public key %s %s signature for %s%s from %.128s "
1.208 naddy 1205: "port %d rejected: user presence "
1206: "(authenticator touch) requirement not met ",
1207: sshkey_type(key), fp,
1.214 djm 1208: authctxt->valid ? "" : "invalid user ",
1209: authctxt->user, ssh_remote_ipaddr(ssh),
1210: ssh_remote_port(ssh));
1211: ret = SSH_ERR_SIGNATURE_INVALID;
1212: }
1213: req_verify = (options.pubkey_auth_options &
1214: PUBKEYAUTH_VERIFY_REQUIRED) || key_opts->require_verify;
1215: if (req_verify &&
1216: (sig_details->sk_flags & SSH_SK_USER_VERIFICATION_REQD) == 0) {
1217: error("public key %s %s signature for %s%s from %.128s "
1218: "port %d rejected: user verification requirement "
1219: "not met ", sshkey_type(key), fp,
1.203 djm 1220: authctxt->valid ? "" : "invalid user ",
1221: authctxt->user, ssh_remote_ipaddr(ssh),
1222: ssh_remote_port(ssh));
1223: ret = SSH_ERR_SIGNATURE_INVALID;
1224: }
1225: }
1.172 djm 1226: auth2_record_key(authctxt, ret == 0, key);
1.136 djm 1227:
1.180 djm 1228: if (key_blobtype == MM_USERKEY)
1229: auth_activate_options(ssh, key_opts);
1.1 provos 1230: monitor_reset_key_state();
1.3 markus 1231:
1.169 markus 1232: sshbuf_reset(m);
1233:
1234: /* encode ret != 0 as positive integer, since we're sending u32 */
1235: encoded_ret = (ret != 0);
1.202 djm 1236: if ((r = sshbuf_put_u32(m, encoded_ret)) != 0 ||
1.205 djm 1237: (r = sshbuf_put_u8(m, sig_details != NULL)) != 0)
1.217 djm 1238: fatal_fr(r, "assemble");
1.202 djm 1239: if (sig_details != NULL) {
1240: if ((r = sshbuf_put_u32(m, sig_details->sk_counter)) != 0 ||
1241: (r = sshbuf_put_u8(m, sig_details->sk_flags)) != 0)
1.217 djm 1242: fatal_fr(r, "assemble sk");
1.202 djm 1243: }
1244: sshkey_sig_details_free(sig_details);
1.59 avsm 1245: mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
1.203 djm 1246:
1247: free(sigalg);
1248: free(fp);
1249: sshkey_free(key);
1.1 provos 1250:
1.169 markus 1251: return ret == 0;
1.1 provos 1252: }
1253:
1.2 markus 1254: static void
1.191 djm 1255: mm_record_login(struct ssh *ssh, Session *s, struct passwd *pw)
1.1 provos 1256: {
1257: socklen_t fromlen;
1258: struct sockaddr_storage from;
1259:
1260: /*
1261: * Get IP address of client. If the connection is not a socket, let
1262: * the address be 0.0.0.0.
1263: */
1264: memset(&from, 0, sizeof(from));
1.24 stevesk 1265: fromlen = sizeof(from);
1.191 djm 1266: if (ssh_packet_connection_is_on_socket(ssh)) {
1267: if (getpeername(ssh_packet_get_connection_in(ssh),
1.198 deraadt 1268: (struct sockaddr *)&from, &fromlen) == -1) {
1.1 provos 1269: debug("getpeername: %.100s", strerror(errno));
1.50 markus 1270: cleanup_exit(255);
1.1 provos 1271: }
1272: }
1273: /* Record that there was a login on that tty from the remote host. */
1274: record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1.158 djm 1275: session_get_remote_name_or_ip(ssh, utmp_len, options.use_dns),
1.24 stevesk 1276: (struct sockaddr *)&from, fromlen);
1.1 provos 1277: }
1278:
1279: static void
1280: mm_session_close(Session *s)
1281: {
1.217 djm 1282: debug3_f("session %d pid %ld", s->self, (long)s->pid);
1.1 provos 1283: if (s->ttyfd != -1) {
1.217 djm 1284: debug3_f("tty %s ptyfd %d", s->tty, s->ptyfd);
1.1 provos 1285: session_pty_cleanup2(s);
1286: }
1.96 djm 1287: session_unused(s->self);
1.1 provos 1288: }
1289:
1290: int
1.191 djm 1291: mm_answer_pty(struct ssh *ssh, int sock, struct sshbuf *m)
1.1 provos 1292: {
1.11 mouring 1293: extern struct monitor *pmonitor;
1.1 provos 1294: Session *s;
1.183 markus 1295: int r, res, fd0;
1.1 provos 1296:
1.217 djm 1297: debug3_f("entering");
1.1 provos 1298:
1.183 markus 1299: sshbuf_reset(m);
1.1 provos 1300: s = session_new();
1301: if (s == NULL)
1302: goto error;
1303: s->authctxt = authctxt;
1304: s->pw = authctxt->pw;
1.11 mouring 1305: s->pid = pmonitor->m_pid;
1.1 provos 1306: res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1307: if (res == 0)
1308: goto error;
1309: pty_setowner(authctxt->pw, s->tty);
1310:
1.183 markus 1311: if ((r = sshbuf_put_u32(m, 1)) != 0 ||
1312: (r = sshbuf_put_cstring(m, s->tty)) != 0)
1.217 djm 1313: fatal_fr(r, "assemble");
1.1 provos 1314:
1315: /* We need to trick ttyslot */
1316: if (dup2(s->ttyfd, 0) == -1)
1.217 djm 1317: fatal_f("dup2");
1.1 provos 1318:
1.191 djm 1319: mm_record_login(ssh, s, authctxt->pw);
1.1 provos 1320:
1321: /* Now we can close the file descriptor again */
1322: close(0);
1.61 dtucker 1323:
1324: /* send messages generated by record_login */
1.183 markus 1325: if ((r = sshbuf_put_stringb(m, loginmsg)) != 0)
1.217 djm 1326: fatal_fr(r, "assemble loginmsg");
1.183 markus 1327: sshbuf_reset(loginmsg);
1.61 dtucker 1328:
1329: mm_request_send(sock, MONITOR_ANS_PTY, m);
1330:
1.92 djm 1331: if (mm_send_fd(sock, s->ptyfd) == -1 ||
1332: mm_send_fd(sock, s->ttyfd) == -1)
1.217 djm 1333: fatal_f("send fds failed");
1.1 provos 1334:
1335: /* make sure nothing uses fd 0 */
1.198 deraadt 1336: if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) == -1)
1.217 djm 1337: fatal_f("open(/dev/null): %s", strerror(errno));
1.1 provos 1338: if (fd0 != 0)
1.217 djm 1339: error_f("fd0 %d != 0", fd0);
1.1 provos 1340:
1.212 deraadt 1341: /* slave side of pty is not needed */
1.1 provos 1342: close(s->ttyfd);
1343: s->ttyfd = s->ptyfd;
1344: /* no need to dup() because nobody closes ptyfd */
1345: s->ptymaster = s->ptyfd;
1346:
1.217 djm 1347: debug3_f("tty %s ptyfd %d", s->tty, s->ttyfd);
1.1 provos 1348:
1349: return (0);
1350:
1351: error:
1352: if (s != NULL)
1353: mm_session_close(s);
1.183 markus 1354: if ((r = sshbuf_put_u32(m, 0)) != 0)
1.217 djm 1355: fatal_fr(r, "assemble 0");
1.59 avsm 1356: mm_request_send(sock, MONITOR_ANS_PTY, m);
1.1 provos 1357: return (0);
1358: }
1359:
1360: int
1.191 djm 1361: mm_answer_pty_cleanup(struct ssh *ssh, int sock, struct sshbuf *m)
1.1 provos 1362: {
1363: Session *s;
1364: char *tty;
1.183 markus 1365: int r;
1.1 provos 1366:
1.217 djm 1367: debug3_f("entering");
1.1 provos 1368:
1.183 markus 1369: if ((r = sshbuf_get_cstring(m, &tty, NULL)) != 0)
1.217 djm 1370: fatal_fr(r, "parse tty");
1.1 provos 1371: if ((s = session_by_tty(tty)) != NULL)
1372: mm_session_close(s);
1.183 markus 1373: sshbuf_reset(m);
1.124 djm 1374: free(tty);
1.1 provos 1375: return (0);
1376: }
1377:
1378: int
1.191 djm 1379: mm_answer_term(struct ssh *ssh, int sock, struct sshbuf *req)
1.1 provos 1380: {
1.11 mouring 1381: extern struct monitor *pmonitor;
1.1 provos 1382: int res, status;
1383:
1.217 djm 1384: debug3_f("tearing down sessions");
1.1 provos 1385:
1386: /* The child is terminating */
1.173 djm 1387: session_destroy_all(ssh, &mm_session_close);
1.1 provos 1388:
1.11 mouring 1389: while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1.9 markus 1390: if (errno != EINTR)
1391: exit(1);
1.1 provos 1392:
1393: res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1394:
1395: /* Terminate process */
1.57 deraadt 1396: exit(res);
1.170 markus 1397: }
1398:
1399: void
1.191 djm 1400: monitor_clear_keystate(struct ssh *ssh, struct monitor *pmonitor)
1.170 markus 1401: {
1402: ssh_clear_newkeys(ssh, MODE_IN);
1403: ssh_clear_newkeys(ssh, MODE_OUT);
1404: sshbuf_free(child_state);
1405: child_state = NULL;
1.1 provos 1406: }
1407:
1408: void
1.191 djm 1409: monitor_apply_keystate(struct ssh *ssh, struct monitor *pmonitor)
1.1 provos 1410: {
1.139 markus 1411: struct kex *kex;
1412: int r;
1413:
1.217 djm 1414: debug3_f("packet_set_state");
1.139 markus 1415: if ((r = ssh_packet_set_state(ssh, child_state)) != 0)
1.217 djm 1416: fatal_fr(r, "packet_set_state");
1.139 markus 1417: sshbuf_free(child_state);
1418: child_state = NULL;
1.223 djm 1419: if ((kex = ssh->kex) == NULL)
1420: fatal_f("internal error: ssh->kex == NULL");
1421: if (session_id2_len != sshbuf_len(ssh->kex->session_id)) {
1422: fatal_f("incorrect session id length %zu (expected %u)",
1423: sshbuf_len(ssh->kex->session_id), session_id2_len);
1424: }
1425: if (memcmp(sshbuf_ptr(ssh->kex->session_id), session_id2,
1426: session_id2_len) != 0)
1427: fatal_f("session ID mismatch");
1428: /* XXX set callbacks */
1.147 djm 1429: #ifdef WITH_OPENSSL
1.223 djm 1430: kex->kex[KEX_DH_GRP1_SHA1] = kex_gen_server;
1431: kex->kex[KEX_DH_GRP14_SHA1] = kex_gen_server;
1432: kex->kex[KEX_DH_GRP14_SHA256] = kex_gen_server;
1433: kex->kex[KEX_DH_GRP16_SHA512] = kex_gen_server;
1434: kex->kex[KEX_DH_GRP18_SHA512] = kex_gen_server;
1435: kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
1436: kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
1437: kex->kex[KEX_ECDH_SHA2] = kex_gen_server;
1.147 djm 1438: #endif
1.223 djm 1439: kex->kex[KEX_C25519_SHA256] = kex_gen_server;
1440: kex->kex[KEX_KEM_SNTRUP761X25519_SHA512] = kex_gen_server;
1441: kex->load_host_public_key=&get_hostkey_public_by_type;
1442: kex->load_host_private_key=&get_hostkey_private_by_type;
1443: kex->host_key_index=&get_hostkey_index;
1444: kex->sign = sshd_hostkey_sign;
1.1 provos 1445: }
1446:
1.210 djm 1447: /* This function requires careful sanity checking */
1.1 provos 1448:
1449: void
1.192 djm 1450: mm_get_keystate(struct ssh *ssh, struct monitor *pmonitor)
1.1 provos 1451: {
1.217 djm 1452: debug3_f("Waiting for new keys");
1.1 provos 1453:
1.139 markus 1454: if ((child_state = sshbuf_new()) == NULL)
1.217 djm 1455: fatal_f("sshbuf_new failed");
1.139 markus 1456: mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT,
1457: child_state);
1.217 djm 1458: debug3_f("GOT new keys");
1.1 provos 1459: }
1460:
1461:
1462: /* XXX */
1463:
1464: #define FD_CLOSEONEXEC(x) do { \
1.111 djm 1465: if (fcntl(x, F_SETFD, FD_CLOEXEC) == -1) \
1.1 provos 1466: fatal("fcntl(%d, F_SETFD)", x); \
1467: } while (0)
1468:
1.2 markus 1469: static void
1.114 djm 1470: monitor_openfds(struct monitor *mon, int do_logfds)
1.3 markus 1471: {
1.114 djm 1472: int pair[2];
1.171 markus 1473: #ifdef SO_ZEROIZE
1474: int on = 1;
1475: #endif
1.114 djm 1476:
1.1 provos 1477: if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1.217 djm 1478: fatal_f("socketpair: %s", strerror(errno));
1.171 markus 1479: #ifdef SO_ZEROIZE
1.198 deraadt 1480: if (setsockopt(pair[0], SOL_SOCKET, SO_ZEROIZE, &on, sizeof(on)) == -1)
1.171 markus 1481: error("setsockopt SO_ZEROIZE(0): %.100s", strerror(errno));
1.198 deraadt 1482: if (setsockopt(pair[1], SOL_SOCKET, SO_ZEROIZE, &on, sizeof(on)) == -1)
1.171 markus 1483: error("setsockopt SO_ZEROIZE(1): %.100s", strerror(errno));
1484: #endif
1.1 provos 1485: FD_CLOSEONEXEC(pair[0]);
1486: FD_CLOSEONEXEC(pair[1]);
1.114 djm 1487: mon->m_recvfd = pair[0];
1488: mon->m_sendfd = pair[1];
1489:
1490: if (do_logfds) {
1491: if (pipe(pair) == -1)
1.217 djm 1492: fatal_f("pipe: %s", strerror(errno));
1.114 djm 1493: FD_CLOSEONEXEC(pair[0]);
1494: FD_CLOSEONEXEC(pair[1]);
1495: mon->m_log_recvfd = pair[0];
1496: mon->m_log_sendfd = pair[1];
1497: } else
1498: mon->m_log_recvfd = mon->m_log_sendfd = -1;
1.1 provos 1499: }
1500:
1501: #define MM_MEMSIZE 65536
1502:
1503: struct monitor *
1504: monitor_init(void)
1505: {
1506: struct monitor *mon;
1507:
1.75 djm 1508: mon = xcalloc(1, sizeof(*mon));
1.114 djm 1509: monitor_openfds(mon, 1);
1.1 provos 1510:
1511: return mon;
1512: }
1513:
1514: void
1515: monitor_reinit(struct monitor *mon)
1516: {
1.114 djm 1517: monitor_openfds(mon, 0);
1.1 provos 1518: }
1.46 markus 1519:
1520: #ifdef GSSAPI
1521: int
1.191 djm 1522: mm_answer_gss_setup_ctx(struct ssh *ssh, int sock, struct sshbuf *m)
1.46 markus 1523: {
1.59 avsm 1524: gss_OID_desc goid;
1.46 markus 1525: OM_uint32 major;
1.183 markus 1526: size_t len;
1.184 djm 1527: u_char *p;
1.183 markus 1528: int r;
1.46 markus 1529:
1.164 djm 1530: if (!options.gss_authentication)
1.217 djm 1531: fatal_f("GSSAPI authentication not enabled");
1.164 djm 1532:
1.184 djm 1533: if ((r = sshbuf_get_string(m, &p, &len)) != 0)
1.217 djm 1534: fatal_fr(r, "parse");
1.184 djm 1535: goid.elements = p;
1.59 avsm 1536: goid.length = len;
1.46 markus 1537:
1.59 avsm 1538: major = ssh_gssapi_server_ctx(&gsscontext, &goid);
1.46 markus 1539:
1.124 djm 1540: free(goid.elements);
1.46 markus 1541:
1.183 markus 1542: sshbuf_reset(m);
1543: if ((r = sshbuf_put_u32(m, major)) != 0)
1.217 djm 1544: fatal_fr(r, "assemble");
1.46 markus 1545:
1.64 stevesk 1546: mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
1.46 markus 1547:
1548: /* Now we have a context, enable the step */
1549: monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1550:
1551: return (0);
1552: }
1553:
1554: int
1.191 djm 1555: mm_answer_gss_accept_ctx(struct ssh *ssh, int sock, struct sshbuf *m)
1.46 markus 1556: {
1557: gss_buffer_desc in;
1558: gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
1.64 stevesk 1559: OM_uint32 major, minor;
1.46 markus 1560: OM_uint32 flags = 0; /* GSI needs this */
1.183 markus 1561: int r;
1.46 markus 1562:
1.164 djm 1563: if (!options.gss_authentication)
1.217 djm 1564: fatal_f("GSSAPI authentication not enabled");
1.164 djm 1565:
1.184 djm 1566: if ((r = ssh_gssapi_get_buffer_desc(m, &in)) != 0)
1.217 djm 1567: fatal_fr(r, "ssh_gssapi_get_buffer_desc");
1.46 markus 1568: major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1.124 djm 1569: free(in.value);
1.46 markus 1570:
1.183 markus 1571: sshbuf_reset(m);
1572: if ((r = sshbuf_put_u32(m, major)) != 0 ||
1573: (r = sshbuf_put_string(m, out.value, out.length)) != 0 ||
1574: (r = sshbuf_put_u32(m, flags)) != 0)
1.217 djm 1575: fatal_fr(r, "assemble");
1.59 avsm 1576: mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
1.46 markus 1577:
1578: gss_release_buffer(&minor, &out);
1579:
1.64 stevesk 1580: if (major == GSS_S_COMPLETE) {
1.46 markus 1581: monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
1582: monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1.52 markus 1583: monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
1.46 markus 1584: }
1585: return (0);
1586: }
1587:
1588: int
1.191 djm 1589: mm_answer_gss_checkmic(struct ssh *ssh, int sock, struct sshbuf *m)
1.52 markus 1590: {
1591: gss_buffer_desc gssbuf, mic;
1592: OM_uint32 ret;
1.184 djm 1593: int r;
1.54 djm 1594:
1.164 djm 1595: if (!options.gss_authentication)
1.217 djm 1596: fatal_f("GSSAPI authentication not enabled");
1.164 djm 1597:
1.184 djm 1598: if ((r = ssh_gssapi_get_buffer_desc(m, &gssbuf)) != 0 ||
1599: (r = ssh_gssapi_get_buffer_desc(m, &mic)) != 0)
1.217 djm 1600: fatal_fr(r, "ssh_gssapi_get_buffer_desc");
1.54 djm 1601:
1.52 markus 1602: ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
1.54 djm 1603:
1.124 djm 1604: free(gssbuf.value);
1605: free(mic.value);
1.54 djm 1606:
1.183 markus 1607: sshbuf_reset(m);
1608: if ((r = sshbuf_put_u32(m, ret)) != 0)
1.217 djm 1609: fatal_fr(r, "assemble");
1.54 djm 1610:
1.59 avsm 1611: mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
1.54 djm 1612:
1.52 markus 1613: if (!GSS_ERROR(ret))
1614: monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1.54 djm 1615:
1.52 markus 1616: return (0);
1617: }
1618:
1619: int
1.191 djm 1620: mm_answer_gss_userok(struct ssh *ssh, int sock, struct sshbuf *m)
1.46 markus 1621: {
1.184 djm 1622: int r, authenticated;
1.172 djm 1623: const char *displayname;
1.164 djm 1624:
1625: if (!options.gss_authentication)
1.217 djm 1626: fatal_f("GSSAPI authentication not enabled");
1.46 markus 1627:
1628: authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1629:
1.183 markus 1630: sshbuf_reset(m);
1631: if ((r = sshbuf_put_u32(m, authenticated)) != 0)
1.217 djm 1632: fatal_fr(r, "assemble");
1.46 markus 1633:
1.217 djm 1634: debug3_f("sending result %d", authenticated);
1.59 avsm 1635: mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
1.46 markus 1636:
1.64 stevesk 1637: auth_method = "gssapi-with-mic";
1.172 djm 1638:
1639: if ((displayname = ssh_gssapi_displayname()) != NULL)
1640: auth2_record_info(authctxt, "%s", displayname);
1.46 markus 1641:
1642: /* Monitor loop will terminate if authenticated */
1643: return (authenticated);
1644: }
1645: #endif /* GSSAPI */
1.100 djm 1646:
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