Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.119
1.119 ! djm 1: /* $OpenBSD: monitor_wrap.c,v 1.118 2020/08/27 01:06:18 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:
1.46 stevesk 28: #include <sys/types.h>
1.51 dtucker 29: #include <sys/uio.h>
1.61 djm 30: #include <sys/queue.h>
1.46 stevesk 31:
1.47 stevesk 32: #include <errno.h>
1.46 stevesk 33: #include <pwd.h>
1.50 deraadt 34: #include <signal.h>
1.49 stevesk 35: #include <stdio.h>
1.48 stevesk 36: #include <string.h>
1.115 naddy 37: #include <stdarg.h>
1.51 dtucker 38: #include <unistd.h>
1.68 dtucker 39:
1.80 markus 40: #ifdef WITH_OPENSSL
1.68 dtucker 41: #include <openssl/bn.h>
42: #include <openssl/dh.h>
1.80 markus 43: #endif
1.1 provos 44:
1.50 deraadt 45: #include "xmalloc.h"
1.1 provos 46: #include "ssh.h"
1.80 markus 47: #ifdef WITH_OPENSSL
1.1 provos 48: #include "dh.h"
1.80 markus 49: #endif
1.103 markus 50: #include "sshbuf.h"
1.106 markus 51: #include "sshkey.h"
1.50 deraadt 52: #include "cipher.h"
1.1 provos 53: #include "kex.h"
1.50 deraadt 54: #include "hostfile.h"
1.1 provos 55: #include "auth.h"
1.22 markus 56: #include "auth-options.h"
1.1 provos 57: #include "packet.h"
58: #include "mac.h"
59: #include "log.h"
60: #include "monitor.h"
1.50 deraadt 61: #ifdef GSSAPI
62: #include "ssh-gss.h"
63: #endif
1.1 provos 64: #include "monitor_wrap.h"
65: #include "atomicio.h"
66: #include "monitor_fdpass.h"
1.45 djm 67: #include "misc.h"
1.1 provos 68:
69: #include "channels.h"
70: #include "session.h"
1.55 dtucker 71: #include "servconf.h"
1.29 markus 72:
1.82 markus 73: #include "ssherr.h"
1.108 djm 74:
1.1 provos 75: /* Imports */
1.7 mouring 76: extern struct monitor *pmonitor;
1.102 markus 77: extern struct sshbuf *loginmsg;
1.55 dtucker 78: extern ServerOptions options;
1.73 djm 79:
80: void
1.119 ! djm 81: mm_log_handler(const char *file, const char *func, int line,
! 82: LogLevel level, const char *msg, void *ctx)
1.73 djm 83: {
1.103 markus 84: struct sshbuf *log_msg;
1.73 djm 85: struct monitor *mon = (struct monitor *)ctx;
1.103 markus 86: int r;
87: size_t len;
1.73 djm 88:
89: if (mon->m_log_sendfd == -1)
90: fatal("%s: no log channel", __func__);
91:
1.103 markus 92: if ((log_msg = sshbuf_new()) == NULL)
93: fatal("%s: sshbuf_new failed", __func__);
1.73 djm 94:
1.103 markus 95: if ((r = sshbuf_put_u32(log_msg, 0)) != 0 || /* length; filled below */
1.119 ! djm 96: (r = sshbuf_put_cstring(log_msg, file)) != 0 ||
! 97: (r = sshbuf_put_cstring(log_msg, func)) != 0 ||
! 98: (r = sshbuf_put_u32(log_msg, (u_int)line)) != 0 ||
1.103 markus 99: (r = sshbuf_put_u32(log_msg, level)) != 0 ||
100: (r = sshbuf_put_cstring(log_msg, msg)) != 0)
101: fatal("%s: buffer error: %s", __func__, ssh_err(r));
102: if ((len = sshbuf_len(log_msg)) < 4 || len > 0xffffffff)
103: fatal("%s: bad length %zu", __func__, len);
104: POKE_U32(sshbuf_mutable_ptr(log_msg), len - 4);
105: if (atomicio(vwrite, mon->m_log_sendfd,
106: sshbuf_mutable_ptr(log_msg), len) != len)
1.73 djm 107: fatal("%s: write: %s", __func__, strerror(errno));
1.103 markus 108: sshbuf_free(log_msg);
1.73 djm 109: }
1.1 provos 110:
1.32 markus 111: int
112: mm_is_monitor(void)
113: {
114: /*
115: * m_pid is only set in the privileged part, and
116: * points to the unprivileged child.
117: */
1.34 markus 118: return (pmonitor && pmonitor->m_pid > 0);
1.32 markus 119: }
120:
1.1 provos 121: void
1.103 markus 122: mm_request_send(int sock, enum monitor_reqtype type, struct sshbuf *m)
1.1 provos 123: {
1.103 markus 124: size_t mlen = sshbuf_len(m);
1.1 provos 125: u_char buf[5];
126:
1.8 markus 127: debug3("%s entering: type %d", __func__, type);
1.1 provos 128:
1.103 markus 129: if (mlen >= 0xffffffff)
130: fatal("%s: bad length %zu", __func__, mlen);
131: POKE_U32(buf, mlen + 1);
1.10 deraadt 132: buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
1.36 avsm 133: if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
1.40 avsm 134: fatal("%s: write: %s", __func__, strerror(errno));
1.103 markus 135: if (atomicio(vwrite, sock, sshbuf_mutable_ptr(m), mlen) != mlen)
1.40 avsm 136: fatal("%s: write: %s", __func__, strerror(errno));
1.1 provos 137: }
138:
139: void
1.103 markus 140: mm_request_receive(int sock, struct sshbuf *m)
1.1 provos 141: {
1.103 markus 142: u_char buf[4], *p = NULL;
1.13 deraadt 143: u_int msg_len;
1.103 markus 144: int r;
1.1 provos 145:
1.8 markus 146: debug3("%s entering", __func__);
1.1 provos 147:
1.40 avsm 148: if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
149: if (errno == EPIPE)
1.32 markus 150: cleanup_exit(255);
1.40 avsm 151: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 152: }
1.103 markus 153: msg_len = PEEK_U32(buf);
1.1 provos 154: if (msg_len > 256 * 1024)
1.8 markus 155: fatal("%s: read: bad msg_len %d", __func__, msg_len);
1.103 markus 156: sshbuf_reset(m);
157: if ((r = sshbuf_reserve(m, msg_len, &p)) != 0)
158: fatal("%s: buffer error: %s", __func__, ssh_err(r));
159: if (atomicio(read, sock, p, msg_len) != msg_len)
1.40 avsm 160: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 161: }
162:
163: void
1.103 markus 164: mm_request_receive_expect(int sock, enum monitor_reqtype type, struct sshbuf *m)
1.1 provos 165: {
166: u_char rtype;
1.103 markus 167: int r;
1.1 provos 168:
1.8 markus 169: debug3("%s entering: type %d", __func__, type);
1.1 provos 170:
1.36 avsm 171: mm_request_receive(sock, m);
1.103 markus 172: if ((r = sshbuf_get_u8(m, &rtype)) != 0)
173: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 174: if (rtype != type)
1.8 markus 175: fatal("%s: read: rtype %d != type %d", __func__,
1.1 provos 176: rtype, type);
177: }
178:
1.80 markus 179: #ifdef WITH_OPENSSL
1.1 provos 180: DH *
181: mm_choose_dh(int min, int nbits, int max)
182: {
183: BIGNUM *p, *g;
1.103 markus 184: int r;
185: u_char success = 0;
186: struct sshbuf *m;
1.1 provos 187:
1.103 markus 188: if ((m = sshbuf_new()) == NULL)
189: fatal("%s: sshbuf_new failed", __func__);
190: if ((r = sshbuf_put_u32(m, min)) != 0 ||
191: (r = sshbuf_put_u32(m, nbits)) != 0 ||
192: (r = sshbuf_put_u32(m, max)) != 0)
193: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 194:
1.103 markus 195: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, m);
1.1 provos 196:
1.8 markus 197: debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
1.103 markus 198: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, m);
1.1 provos 199:
1.103 markus 200: if ((r = sshbuf_get_u8(m, &success)) != 0)
201: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 202: if (success == 0)
1.8 markus 203: fatal("%s: MONITOR_ANS_MODULI failed", __func__);
1.1 provos 204:
1.112 djm 205: if ((r = sshbuf_get_bignum2(m, &p)) != 0 ||
206: (r = sshbuf_get_bignum2(m, &g)) != 0)
1.103 markus 207: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 208:
1.103 markus 209: debug3("%s: remaining %zu", __func__, sshbuf_len(m));
210: sshbuf_free(m);
1.1 provos 211:
212: return (dh_new_group(g, p));
213: }
1.80 markus 214: #endif
1.1 provos 215:
216: int
1.111 djm 217: mm_sshkey_sign(struct ssh *ssh, struct sshkey *key, u_char **sigp, size_t *lenp,
1.114 djm 218: const u_char *data, size_t datalen, const char *hostkey_alg,
1.118 djm 219: const char *sk_provider, const char *sk_pin, u_int compat)
1.1 provos 220: {
1.83 markus 221: struct kex *kex = *pmonitor->m_pkex;
1.103 markus 222: struct sshbuf *m;
1.111 djm 223: u_int ndx = kex->host_key_index(key, 0, ssh);
1.103 markus 224: int r;
1.1 provos 225:
1.8 markus 226: debug3("%s entering", __func__);
1.103 markus 227: if ((m = sshbuf_new()) == NULL)
228: fatal("%s: sshbuf_new failed", __func__);
229: if ((r = sshbuf_put_u32(m, ndx)) != 0 ||
230: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
1.106 markus 231: (r = sshbuf_put_cstring(m, hostkey_alg)) != 0 ||
232: (r = sshbuf_put_u32(m, compat)) != 0)
1.103 markus 233: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 234:
1.103 markus 235: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, m);
1.1 provos 236:
1.8 markus 237: debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
1.103 markus 238: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, m);
1.106 markus 239: if ((r = sshbuf_get_string(m, sigp, lenp)) != 0)
1.103 markus 240: fatal("%s: buffer error: %s", __func__, ssh_err(r));
241: sshbuf_free(m);
1.1 provos 242:
243: return (0);
244: }
245:
246: struct passwd *
1.109 djm 247: mm_getpwnamallow(struct ssh *ssh, const char *username)
1.1 provos 248: {
1.103 markus 249: struct sshbuf *m;
1.1 provos 250: struct passwd *pw;
1.103 markus 251: size_t len;
252: u_int i;
1.55 dtucker 253: ServerOptions *newopts;
1.103 markus 254: int r;
255: u_char ok;
256: const u_char *p;
1.1 provos 257:
1.8 markus 258: debug3("%s entering", __func__);
1.1 provos 259:
1.103 markus 260: if ((m = sshbuf_new()) == NULL)
261: fatal("%s: sshbuf_new failed", __func__);
262: if ((r = sshbuf_put_cstring(m, username)) != 0)
263: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 264:
1.103 markus 265: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, m);
1.1 provos 266:
1.8 markus 267: debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
1.103 markus 268: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, m);
1.1 provos 269:
1.103 markus 270: if ((r = sshbuf_get_u8(m, &ok)) != 0)
271: fatal("%s: buffer error: %s", __func__, ssh_err(r));
272: if (ok == 0) {
1.60 dtucker 273: pw = NULL;
274: goto out;
1.1 provos 275: }
1.103 markus 276:
277: /* XXX don't like passing struct passwd like this */
278: pw = xcalloc(sizeof(*pw), 1);
279: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
280: fatal("%s: buffer error: %s", __func__, ssh_err(r));
281: if (len != sizeof(*pw))
1.8 markus 282: fatal("%s: struct passwd size mismatch", __func__);
1.103 markus 283: memcpy(pw, p, sizeof(*pw));
284:
285: if ((r = sshbuf_get_cstring(m, &pw->pw_name, NULL)) != 0 ||
286: (r = sshbuf_get_cstring(m, &pw->pw_passwd, NULL)) != 0 ||
287: (r = sshbuf_get_cstring(m, &pw->pw_gecos, NULL)) != 0 ||
288: (r = sshbuf_get_cstring(m, &pw->pw_class, NULL)) != 0 ||
289: (r = sshbuf_get_cstring(m, &pw->pw_dir, NULL)) != 0 ||
290: (r = sshbuf_get_cstring(m, &pw->pw_shell, NULL)) != 0)
291: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.55 dtucker 292:
1.60 dtucker 293: out:
1.55 dtucker 294: /* copy options block as a Match directive may have changed some */
1.103 markus 295: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
296: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.55 dtucker 297: if (len != sizeof(*newopts))
298: fatal("%s: option block size mismatch", __func__);
1.103 markus 299: newopts = xcalloc(sizeof(*newopts), 1);
300: memcpy(newopts, p, sizeof(*newopts));
1.71 djm 301:
302: #define M_CP_STROPT(x) do { \
1.103 markus 303: if (newopts->x != NULL) { \
304: if ((r = sshbuf_get_cstring(m, \
305: &newopts->x, NULL)) != 0) \
306: fatal("%s: buffer error: %s", \
307: __func__, ssh_err(r)); \
308: } \
1.71 djm 309: } while (0)
1.72 djm 310: #define M_CP_STRARRAYOPT(x, nx) do { \
1.95 djm 311: newopts->x = newopts->nx == 0 ? \
312: NULL : xcalloc(newopts->nx, sizeof(*newopts->x)); \
1.103 markus 313: for (i = 0; i < newopts->nx; i++) { \
314: if ((r = sshbuf_get_cstring(m, \
315: &newopts->x[i], NULL)) != 0) \
316: fatal("%s: buffer error: %s", \
317: __func__, ssh_err(r)); \
318: } \
1.72 djm 319: } while (0)
1.71 djm 320: /* See comment in servconf.h */
321: COPY_MATCH_STRING_OPTS();
322: #undef M_CP_STROPT
1.72 djm 323: #undef M_CP_STRARRAYOPT
1.71 djm 324:
1.55 dtucker 325: copy_set_server_options(&options, newopts, 1);
1.90 djm 326: log_change_level(options.log_level);
1.93 djm 327: process_permitopen(ssh, &options);
1.76 djm 328: free(newopts);
1.55 dtucker 329:
1.103 markus 330: sshbuf_free(m);
1.1 provos 331:
332: return (pw);
1.6 djm 333: }
334:
1.33 markus 335: char *
336: mm_auth2_read_banner(void)
1.6 djm 337: {
1.103 markus 338: struct sshbuf *m;
1.6 djm 339: char *banner;
1.103 markus 340: int r;
1.6 djm 341:
1.8 markus 342: debug3("%s entering", __func__);
1.6 djm 343:
1.103 markus 344: if ((m = sshbuf_new()) == NULL)
345: fatal("%s: sshbuf_new failed", __func__);
346: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, m);
347: sshbuf_reset(m);
1.6 djm 348:
1.33 markus 349: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 350: MONITOR_ANS_AUTH2_READ_BANNER, m);
351: if ((r = sshbuf_get_cstring(m, &banner, NULL)) != 0)
352: fatal("%s: buffer error: %s", __func__, ssh_err(r));
353: sshbuf_free(m);
1.10 deraadt 354:
1.33 markus 355: /* treat empty banner as missing banner */
356: if (strlen(banner) == 0) {
1.76 djm 357: free(banner);
1.33 markus 358: banner = NULL;
359: }
1.6 djm 360: return (banner);
1.1 provos 361: }
362:
363: /* Inform the privileged process about service and style */
364:
365: void
366: mm_inform_authserv(char *service, char *style)
367: {
1.103 markus 368: struct sshbuf *m;
369: int r;
1.1 provos 370:
1.8 markus 371: debug3("%s entering", __func__);
1.1 provos 372:
1.103 markus 373: if ((m = sshbuf_new()) == NULL)
374: fatal("%s: sshbuf_new failed", __func__);
375: if ((r = sshbuf_put_cstring(m, service)) != 0 ||
376: (r = sshbuf_put_cstring(m, style ? style : "")) != 0)
377: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 378:
1.103 markus 379: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, m);
1.1 provos 380:
1.103 markus 381: sshbuf_free(m);
1.1 provos 382: }
383:
384: /* Do the password authentication */
385: int
1.99 djm 386: mm_auth_password(struct ssh *ssh, char *password)
1.1 provos 387: {
1.103 markus 388: struct sshbuf *m;
389: int r, authenticated = 0;
1.1 provos 390:
1.8 markus 391: debug3("%s entering", __func__);
1.1 provos 392:
1.103 markus 393: if ((m = sshbuf_new()) == NULL)
394: fatal("%s: sshbuf_new failed", __func__);
395: if ((r = sshbuf_put_cstring(m, password)) != 0)
396: fatal("%s: buffer error: %s", __func__, ssh_err(r));
397: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, m);
1.1 provos 398:
1.8 markus 399: debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
1.103 markus 400: mm_request_receive_expect(pmonitor->m_recvfd,
401: MONITOR_ANS_AUTHPASSWORD, m);
1.1 provos 402:
1.103 markus 403: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
404: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 405:
1.103 markus 406: sshbuf_free(m);
1.1 provos 407:
1.3 markus 408: debug3("%s: user %sauthenticated",
1.8 markus 409: __func__, authenticated ? "" : "not ");
1.1 provos 410: return (authenticated);
411: }
412:
413: int
1.99 djm 414: mm_user_key_allowed(struct ssh *ssh, struct passwd *pw, struct sshkey *key,
415: int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 416: {
1.85 djm 417: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key,
1.99 djm 418: pubkey_auth_attempt, authoptp));
1.1 provos 419: }
420:
421: int
1.111 djm 422: mm_hostbased_key_allowed(struct ssh *ssh, struct passwd *pw,
423: const char *user, const char *host, struct sshkey *key)
1.1 provos 424: {
1.99 djm 425: return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0, NULL));
1.1 provos 426: }
427:
428: int
1.88 djm 429: mm_key_allowed(enum mm_keytype type, const char *user, const char *host,
1.99 djm 430: struct sshkey *key, int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 431: {
1.103 markus 432: struct sshbuf *m;
1.99 djm 433: int r, allowed = 0;
434: struct sshauthopt *opts = NULL;
1.1 provos 435:
1.8 markus 436: debug3("%s entering", __func__);
1.1 provos 437:
1.99 djm 438: if (authoptp != NULL)
439: *authoptp = NULL;
440:
1.103 markus 441: if ((m = sshbuf_new()) == NULL)
442: fatal("%s: sshbuf_new failed", __func__);
443: if ((r = sshbuf_put_u32(m, type)) != 0 ||
444: (r = sshbuf_put_cstring(m, user ? user : "")) != 0 ||
445: (r = sshbuf_put_cstring(m, host ? host : "")) != 0 ||
446: (r = sshkey_puts(key, m)) != 0 ||
447: (r = sshbuf_put_u32(m, pubkey_auth_attempt)) != 0)
448: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 449:
1.103 markus 450: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, m);
1.1 provos 451:
1.8 markus 452: debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
1.99 djm 453: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 454: MONITOR_ANS_KEYALLOWED, m);
1.1 provos 455:
1.103 markus 456: if ((r = sshbuf_get_u32(m, &allowed)) != 0)
457: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.99 djm 458: if (allowed && type == MM_USERKEY) {
1.103 markus 459: if ((r = sshauthopt_deserialise(m, &opts)) != 0)
1.99 djm 460: fatal("%s: sshauthopt_deserialise: %s",
461: __func__, ssh_err(r));
462: }
1.103 markus 463: sshbuf_free(m);
1.1 provos 464:
1.99 djm 465: if (authoptp != NULL) {
466: *authoptp = opts;
467: opts = NULL;
468: }
469: sshauthopt_free(opts);
1.1 provos 470:
1.99 djm 471: return allowed;
1.1 provos 472: }
473:
1.3 markus 474: /*
1.1 provos 475: * This key verify needs to send the key type along, because the
476: * privileged parent makes the decision if the key is allowed
477: * for authentication.
478: */
479:
480: int
1.92 markus 481: mm_sshkey_verify(const struct sshkey *key, const u_char *sig, size_t siglen,
1.116 djm 482: const u_char *data, size_t datalen, const char *sigalg, u_int compat,
483: struct sshkey_sig_details **sig_detailsp)
1.1 provos 484: {
1.103 markus 485: struct sshbuf *m;
1.92 markus 486: u_int encoded_ret = 0;
1.103 markus 487: int r;
1.116 djm 488: u_char sig_details_present, flags;
489: u_int counter;
1.1 provos 490:
1.8 markus 491: debug3("%s entering", __func__);
1.1 provos 492:
1.116 djm 493: if (sig_detailsp != NULL)
494: *sig_detailsp = NULL;
1.103 markus 495: if ((m = sshbuf_new()) == NULL)
496: fatal("%s: sshbuf_new failed", __func__);
497: if ((r = sshkey_puts(key, m)) != 0 ||
498: (r = sshbuf_put_string(m, sig, siglen)) != 0 ||
499: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
500: (r = sshbuf_put_cstring(m, sigalg == NULL ? "" : sigalg)) != 0)
501: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 502:
1.103 markus 503: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, m);
1.1 provos 504:
1.8 markus 505: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
1.103 markus 506: mm_request_receive_expect(pmonitor->m_recvfd,
507: MONITOR_ANS_KEYVERIFY, m);
1.1 provos 508:
1.116 djm 509: if ((r = sshbuf_get_u32(m, &encoded_ret)) != 0 ||
510: (r = sshbuf_get_u8(m, &sig_details_present)) != 0)
1.103 markus 511: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.116 djm 512: if (sig_details_present && encoded_ret == 0) {
513: if ((r = sshbuf_get_u32(m, &counter)) != 0 ||
514: (r = sshbuf_get_u8(m, &flags)) != 0)
515: fatal("%s: buffer error: %s", __func__, ssh_err(r));
516: if (sig_detailsp != NULL) {
517: *sig_detailsp = xcalloc(1, sizeof(**sig_detailsp));
518: (*sig_detailsp)->sk_counter = counter;
519: (*sig_detailsp)->sk_flags = flags;
520: }
521: }
1.1 provos 522:
1.103 markus 523: sshbuf_free(m);
1.1 provos 524:
1.92 markus 525: if (encoded_ret != 0)
526: return SSH_ERR_SIGNATURE_INVALID;
527: return 0;
1.1 provos 528: }
529:
530: void
1.111 djm 531: mm_send_keystate(struct ssh *ssh, struct monitor *monitor)
1.1 provos 532: {
1.82 markus 533: struct sshbuf *m;
534: int r;
535:
536: if ((m = sshbuf_new()) == NULL)
537: fatal("%s: sshbuf_new failed", __func__);
538: if ((r = ssh_packet_get_state(ssh, m)) != 0)
539: fatal("%s: get_state failed: %s",
540: __func__, ssh_err(r));
541: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m);
1.8 markus 542: debug3("%s: Finished sending state", __func__);
1.82 markus 543: sshbuf_free(m);
1.1 provos 544: }
545:
546: int
1.42 deraadt 547: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 548: {
1.103 markus 549: struct sshbuf *m;
1.39 dtucker 550: char *p, *msg;
1.102 markus 551: int success = 0, tmp1 = -1, tmp2 = -1, r;
1.62 djm 552:
553: /* Kludge: ensure there are fds free to receive the pty/tty */
554: if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
555: (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
556: error("%s: cannot allocate fds for pty", __func__);
557: if (tmp1 > 0)
558: close(tmp1);
559: if (tmp2 > 0)
560: close(tmp2);
561: return 0;
562: }
563: close(tmp1);
564: close(tmp2);
1.1 provos 565:
1.103 markus 566: if ((m = sshbuf_new()) == NULL)
567: fatal("%s: sshbuf_new failed", __func__);
568: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, m);
1.1 provos 569:
1.8 markus 570: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.103 markus 571: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, m);
1.1 provos 572:
1.103 markus 573: if ((r = sshbuf_get_u32(m, &success)) != 0)
574: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 575: if (success == 0) {
1.8 markus 576: debug3("%s: pty alloc failed", __func__);
1.103 markus 577: sshbuf_free(m);
1.1 provos 578: return (0);
579: }
1.103 markus 580: if ((r = sshbuf_get_cstring(m, &p, NULL)) != 0 ||
581: (r = sshbuf_get_cstring(m, &msg, NULL)) != 0)
582: fatal("%s: buffer error: %s", __func__, ssh_err(r));
583: sshbuf_free(m);
1.1 provos 584:
585: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
1.76 djm 586: free(p);
1.39 dtucker 587:
1.102 markus 588: if ((r = sshbuf_put(loginmsg, msg, strlen(msg))) != 0)
589: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.76 djm 590: free(msg);
1.1 provos 591:
1.58 djm 592: if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
593: (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
594: fatal("%s: receive fds failed", __func__);
1.1 provos 595:
596: /* Success */
597: return (1);
598: }
599:
600: void
1.32 markus 601: mm_session_pty_cleanup2(Session *s)
1.1 provos 602: {
1.103 markus 603: struct sshbuf *m;
604: int r;
1.1 provos 605:
606: if (s->ttyfd == -1)
607: return;
1.103 markus 608: if ((m = sshbuf_new()) == NULL)
609: fatal("%s: sshbuf_new failed", __func__);
610: if ((r = sshbuf_put_cstring(m, s->tty)) != 0)
611: fatal("%s: buffer error: %s", __func__, ssh_err(r));
612: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, m);
613: sshbuf_free(m);
1.3 markus 614:
1.1 provos 615: /* closed dup'ed master */
1.113 deraadt 616: if (s->ptymaster != -1 && close(s->ptymaster) == -1)
1.62 djm 617: error("close(s->ptymaster/%d): %s",
618: s->ptymaster, strerror(errno));
1.1 provos 619:
620: /* unlink pty from session */
621: s->ttyfd = -1;
622: }
623:
624: /* Request process termination */
625:
626: void
627: mm_terminate(void)
628: {
1.103 markus 629: struct sshbuf *m;
1.1 provos 630:
1.103 markus 631: if ((m = sshbuf_new()) == NULL)
632: fatal("%s: sshbuf_new failed", __func__);
633: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, m);
634: sshbuf_free(m);
1.1 provos 635: }
636:
1.2 markus 637: static void
1.1 provos 638: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
639: char ***prompts, u_int **echo_on)
640: {
1.10 deraadt 641: *name = xstrdup("");
642: *infotxt = xstrdup("");
1.1 provos 643: *numprompts = 1;
1.43 djm 644: *prompts = xcalloc(*numprompts, sizeof(char *));
645: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 646: (*echo_on)[0] = 0;
647: }
648:
649: int
650: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
651: u_int *numprompts, char ***prompts, u_int **echo_on)
652: {
1.103 markus 653: struct sshbuf *m;
1.21 markus 654: u_int success;
1.1 provos 655: char *challenge;
1.103 markus 656: int r;
1.1 provos 657:
1.8 markus 658: debug3("%s: entering", __func__);
1.1 provos 659:
1.103 markus 660: if ((m = sshbuf_new()) == NULL)
661: fatal("%s: sshbuf_new failed", __func__);
662: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, m);
1.1 provos 663:
1.103 markus 664: mm_request_receive_expect(pmonitor->m_recvfd,
665: MONITOR_ANS_BSDAUTHQUERY, m);
666: if ((r = sshbuf_get_u32(m, &success)) != 0)
667: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.21 markus 668: if (success == 0) {
1.8 markus 669: debug3("%s: no challenge", __func__);
1.103 markus 670: sshbuf_free(m);
1.1 provos 671: return (-1);
672: }
673:
674: /* Get the challenge, and format the response */
1.103 markus 675: if ((r = sshbuf_get_cstring(m, &challenge, NULL)) != 0)
676: fatal("%s: buffer error: %s", __func__, ssh_err(r));
677: sshbuf_free(m);
1.1 provos 678:
679: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
680: (*prompts)[0] = challenge;
681:
1.8 markus 682: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 683:
684: return (0);
685: }
686:
687: int
688: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
689: {
1.103 markus 690: struct sshbuf *m;
691: int r, authok;
1.1 provos 692:
1.8 markus 693: debug3("%s: entering", __func__);
1.1 provos 694: if (numresponses != 1)
695: return (-1);
696:
1.103 markus 697: if ((m = sshbuf_new()) == NULL)
698: fatal("%s: sshbuf_new failed", __func__);
699: if ((r = sshbuf_put_cstring(m, responses[0])) != 0)
700: fatal("%s: buffer error: %s", __func__, ssh_err(r));
701: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, m);
1.1 provos 702:
1.7 mouring 703: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 704: MONITOR_ANS_BSDAUTHRESPOND, m);
1.1 provos 705:
1.103 markus 706: if ((r = sshbuf_get_u32(m, &authok)) != 0)
707: fatal("%s: buffer error: %s", __func__, ssh_err(r));
708: sshbuf_free(m);
1.1 provos 709:
710: return ((authok == 0) ? -1 : 0);
711: }
1.29 markus 712:
713: #ifdef GSSAPI
714: OM_uint32
1.36 avsm 715: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 716: {
1.103 markus 717: struct sshbuf *m;
1.29 markus 718: OM_uint32 major;
1.103 markus 719: int r;
1.29 markus 720:
721: /* Client doesn't get to see the context */
722: *ctx = NULL;
723:
1.103 markus 724: if ((m = sshbuf_new()) == NULL)
725: fatal("%s: sshbuf_new failed", __func__);
726: if ((r = sshbuf_put_string(m, goid->elements, goid->length)) != 0)
727: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 728:
1.103 markus 729: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, m);
730: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, m);
1.29 markus 731:
1.103 markus 732: if ((r = sshbuf_get_u32(m, &major)) != 0)
733: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 734:
1.103 markus 735: sshbuf_free(m);
1.29 markus 736: return (major);
737: }
738:
739: OM_uint32
740: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1.103 markus 741: gss_buffer_desc *out, OM_uint32 *flagsp)
1.29 markus 742: {
1.103 markus 743: struct sshbuf *m;
1.29 markus 744: OM_uint32 major;
1.103 markus 745: u_int flags;
746: int r;
1.29 markus 747:
1.103 markus 748: if ((m = sshbuf_new()) == NULL)
749: fatal("%s: sshbuf_new failed", __func__);
750: if ((r = sshbuf_put_string(m, in->value, in->length)) != 0)
751: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 752:
1.103 markus 753: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, m);
754: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, m);
1.29 markus 755:
1.103 markus 756: if ((r = sshbuf_get_u32(m, &major)) != 0 ||
1.104 djm 757: (r = ssh_gssapi_get_buffer_desc(m, out)) != 0)
1.103 markus 758: fatal("%s: buffer error: %s", __func__, ssh_err(r));
759: if (flagsp != NULL) {
760: if ((r = sshbuf_get_u32(m, &flags)) != 0)
761: fatal("%s: buffer error: %s", __func__, ssh_err(r));
762: *flagsp = flags;
763: }
1.29 markus 764:
1.103 markus 765: sshbuf_free(m);
1.29 markus 766:
767: return (major);
1.35 markus 768: }
769:
770: OM_uint32
771: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
772: {
1.103 markus 773: struct sshbuf *m;
1.35 markus 774: OM_uint32 major;
1.103 markus 775: int r;
776:
777: if ((m = sshbuf_new()) == NULL)
778: fatal("%s: sshbuf_new failed", __func__);
779: if ((r = sshbuf_put_string(m, gssbuf->value, gssbuf->length)) != 0 ||
780: (r = sshbuf_put_string(m, gssmic->value, gssmic->length)) != 0)
781: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.35 markus 782:
1.103 markus 783: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, m);
784: mm_request_receive_expect(pmonitor->m_recvfd,
785: MONITOR_ANS_GSSCHECKMIC, m);
1.35 markus 786:
1.103 markus 787: if ((r = sshbuf_get_u32(m, &major)) != 0)
788: fatal("%s: buffer error: %s", __func__, ssh_err(r));
789: sshbuf_free(m);
1.35 markus 790: return(major);
1.29 markus 791: }
792:
793: int
794: mm_ssh_gssapi_userok(char *user)
795: {
1.103 markus 796: struct sshbuf *m;
797: int r, authenticated = 0;
1.29 markus 798:
1.103 markus 799: if ((m = sshbuf_new()) == NULL)
800: fatal("%s: sshbuf_new failed", __func__);
1.29 markus 801:
1.103 markus 802: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, m);
803: mm_request_receive_expect(pmonitor->m_recvfd,
804: MONITOR_ANS_GSSUSEROK, m);
1.29 markus 805:
1.103 markus 806: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
807: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 808:
1.103 markus 809: sshbuf_free(m);
1.29 markus 810: debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
811: return (authenticated);
812: }
813: #endif /* GSSAPI */